/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench/ps6-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 15:22:16,070 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 15:22:16,071 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 15:22:16,093 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-06 15:22:16,093 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-06 15:22:16,094 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-06 15:22:16,095 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-06 15:22:16,096 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-06 15:22:16,097 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-06 15:22:16,098 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-06 15:22:16,098 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-06 15:22:16,104 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-06 15:22:16,105 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 15:22:16,106 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 15:22:16,107 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 15:22:16,108 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 15:22:16,108 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 15:22:16,109 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 15:22:16,110 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 15:22:16,111 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 15:22:16,112 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 15:22:16,117 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 15:22:16,121 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 15:22:16,122 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 15:22:16,123 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 15:22:16,128 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-04-06 15:22:16,128 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-04-06 15:22:16,128 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-04-06 15:22:16,129 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-04-06 15:22:16,129 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-04-06 15:22:16,130 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-04-06 15:22:16,130 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-04-06 15:22:16,130 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-04-06 15:22:16,131 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-04-06 15:22:16,131 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-04-06 15:22:16,132 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-04-06 15:22:16,132 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-04-06 15:22:16,136 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-04-06 15:22:16,137 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-04-06 15:22:16,137 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 15:22:16,138 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 15:22:16,140 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 15:22:16,140 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 15:22:16,151 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 15:22:16,151 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 15:22:16,152 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 15:22:16,152 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 15:22:16,152 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 15:22:16,152 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 15:22:16,152 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 15:22:16,152 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 15:22:16,152 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 15:22:16,153 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 15:22:16,153 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 15:22:16,153 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 15:22:16,153 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 15:22:16,153 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 15:22:16,153 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 15:22:16,153 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:22:16,154 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 15:22:16,154 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 15:22:16,342 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 15:22:16,356 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 15:22:16,358 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 15:22:16,358 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 15:22:16,361 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 15:22:16,362 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps6-ll.c [2022-04-06 15:22:16,428 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2bec521e/fb85165e01f14748acd4ad3d7a400b52/FLAGb502da5ee [2022-04-06 15:22:16,763 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 15:22:16,763 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps6-ll.c [2022-04-06 15:22:16,767 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2bec521e/fb85165e01f14748acd4ad3d7a400b52/FLAGb502da5ee [2022-04-06 15:22:17,205 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2bec521e/fb85165e01f14748acd4ad3d7a400b52 [2022-04-06 15:22:17,207 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 15:22:17,209 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 15:22:17,211 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 15:22:17,211 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 15:22:17,213 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 15:22:17,214 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,215 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c0ec98a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17, skipping insertion in model container [2022-04-06 15:22:17,215 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,219 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 15:22:17,231 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 15:22:17,338 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps6-ll.c[458,471] [2022-04-06 15:22:17,355 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:22:17,360 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 15:22:17,368 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps6-ll.c[458,471] [2022-04-06 15:22:17,373 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:22:17,382 INFO L208 MainTranslator]: Completed translation [2022-04-06 15:22:17,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17 WrapperNode [2022-04-06 15:22:17,382 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 15:22:17,383 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 15:22:17,383 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 15:22:17,383 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 15:22:17,391 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,391 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,395 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,395 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,398 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,400 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,401 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,402 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 15:22:17,403 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 15:22:17,403 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 15:22:17,403 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 15:22:17,408 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (1/1) ... [2022-04-06 15:22:17,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:22:17,428 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:17,440 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 15:22:17,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 15:22:17,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 15:22:17,471 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 15:22:17,458 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 15:22:17,471 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 15:22:17,475 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 15:22:17,475 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 15:22:17,475 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 15:22:17,475 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 15:22:17,476 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 15:22:17,476 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 15:22:17,476 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2022-04-06 15:22:17,477 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 15:22:17,478 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 15:22:17,527 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 15:22:17,528 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 15:22:17,634 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 15:22:17,638 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 15:22:17,638 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-04-06 15:22:17,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:22:17 BoogieIcfgContainer [2022-04-06 15:22:17,640 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 15:22:17,643 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 15:22:17,643 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 15:22:17,645 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 15:22:17,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 03:22:17" (1/3) ... [2022-04-06 15:22:17,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35f9b582 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:22:17, skipping insertion in model container [2022-04-06 15:22:17,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:22:17" (2/3) ... [2022-04-06 15:22:17,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35f9b582 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:22:17, skipping insertion in model container [2022-04-06 15:22:17,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:22:17" (3/3) ... [2022-04-06 15:22:17,664 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll.c [2022-04-06 15:22:17,668 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 15:22:17,668 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 15:22:17,699 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 15:22:17,704 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 15:22:17,704 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 15:22:17,721 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 15:22:17,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 15:22:17,726 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:17,727 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:17,727 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:17,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:17,731 INFO L85 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 1 times [2022-04-06 15:22:17,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:17,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [925376467] [2022-04-06 15:22:17,745 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:22:17,745 INFO L85 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 2 times [2022-04-06 15:22:17,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:17,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177398203] [2022-04-06 15:22:17,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:17,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:17,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:22:17,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:22:17,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:22:17,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 15:22:17,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:22:17,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:17,862 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:17,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177398203] [2022-04-06 15:22:17,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177398203] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:17,863 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:17,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 15:22:17,865 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:17,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [925376467] [2022-04-06 15:22:17,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [925376467] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:17,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:17,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 15:22:17,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901596135] [2022-04-06 15:22:17,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:17,869 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 15:22:17,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:17,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 15:22:17,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 15:22:17,890 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 15:22:25,601 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 7.45s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 15:22:25,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:25,613 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2022-04-06 15:22:25,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 15:22:25,615 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-04-06 15:22:25,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:25,620 INFO L225 Difference]: With dead ends: 47 [2022-04-06 15:22:25,620 INFO L226 Difference]: Without dead ends: 23 [2022-04-06 15:22:25,621 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 15:22:25,624 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:25,625 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 30 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 7.7s Time] [2022-04-06 15:22:25,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-04-06 15:22:25,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-04-06 15:22:25,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 15:22:25,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-04-06 15:22:25,650 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2022-04-06 15:22:25,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:25,650 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-04-06 15:22:25,650 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 15:22:25,651 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-04-06 15:22:25,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 15:22:25,652 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:25,652 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:25,652 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 15:22:25,652 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:25,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:25,653 INFO L85 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 1 times [2022-04-06 15:22:25,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:25,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1064729530] [2022-04-06 15:22:25,654 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:22:25,654 INFO L85 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 2 times [2022-04-06 15:22:25,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:25,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476349493] [2022-04-06 15:22:25,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:25,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:25,667 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:25,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1775249532] [2022-04-06 15:22:25,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:25,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:25,668 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:25,669 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:25,670 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 15:22:25,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-04-06 15:22:25,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:25,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 15:22:25,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:25,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:25,835 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 15:22:25,836 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:25,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476349493] [2022-04-06 15:22:25,836 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:25,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775249532] [2022-04-06 15:22:25,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1775249532] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:25,837 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:25,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:22:25,837 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:25,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1064729530] [2022-04-06 15:22:25,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1064729530] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:25,839 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:25,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:22:25,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888152786] [2022-04-06 15:22:25,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:25,845 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 15:22:25,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:25,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 15:22:25,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 15:22:25,846 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 15:22:25,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:25,911 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-04-06 15:22:25,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 15:22:25,911 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-04-06 15:22:25,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:25,912 INFO L225 Difference]: With dead ends: 34 [2022-04-06 15:22:25,912 INFO L226 Difference]: Without dead ends: 30 [2022-04-06 15:22:25,912 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 15:22:25,913 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:25,914 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 77 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 15:22:25,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-04-06 15:22:25,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-04-06 15:22:25,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 15:22:25,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-04-06 15:22:25,921 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2022-04-06 15:22:25,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:25,921 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-04-06 15:22:25,921 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 15:22:25,922 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-04-06 15:22:25,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-04-06 15:22:25,922 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:25,922 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:25,942 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:26,135 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:26,136 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:26,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:26,136 INFO L85 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 1 times [2022-04-06 15:22:26,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:26,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [653216384] [2022-04-06 15:22:26,151 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:26,152 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:26,152 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:26,152 INFO L85 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 2 times [2022-04-06 15:22:26,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:26,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143070547] [2022-04-06 15:22:26,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:26,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:26,173 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:26,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1717052284] [2022-04-06 15:22:26,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:26,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:26,174 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:26,174 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:26,176 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 15:22:26,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:22:26,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:26,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 15:22:26,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:26,339 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:22:26,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:26,507 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 15:22:26,508 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:26,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143070547] [2022-04-06 15:22:26,508 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:26,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717052284] [2022-04-06 15:22:26,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717052284] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:26,508 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:26,508 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-04-06 15:22:26,509 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:26,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [653216384] [2022-04-06 15:22:26,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [653216384] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:26,509 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:26,509 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 15:22:26,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369852974] [2022-04-06 15:22:26,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:26,509 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 15:22:26,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:26,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 15:22:26,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-04-06 15:22:26,510 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 15:22:26,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:26,548 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2022-04-06 15:22:26,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 15:22:26,548 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2022-04-06 15:22:26,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:26,549 INFO L225 Difference]: With dead ends: 36 [2022-04-06 15:22:26,549 INFO L226 Difference]: Without dead ends: 32 [2022-04-06 15:22:26,549 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 15:22:26,550 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:26,550 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 67 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 15:22:26,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-04-06 15:22:26,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-04-06 15:22:26,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 7 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 15:22:26,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-04-06 15:22:26,557 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 24 [2022-04-06 15:22:26,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:26,558 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-04-06 15:22:26,558 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 15:22:26,558 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-04-06 15:22:26,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-04-06 15:22:26,558 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:26,559 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:26,576 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:26,771 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-04-06 15:22:26,772 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:26,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:26,772 INFO L85 PathProgramCache]: Analyzing trace with hash 1106328449, now seen corresponding path program 1 times [2022-04-06 15:22:26,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:26,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [728740357] [2022-04-06 15:22:26,775 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:26,776 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:26,776 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:26,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1106328449, now seen corresponding path program 2 times [2022-04-06 15:22:26,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:26,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817238880] [2022-04-06 15:22:26,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:26,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:26,784 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:26,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1170652940] [2022-04-06 15:22:26,785 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:26,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:26,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:26,786 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:26,791 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 15:22:26,818 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:22:26,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:26,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 15:22:26,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:26,984 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 15:22:26,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:27,150 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:27,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817238880] [2022-04-06 15:22:27,151 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:27,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170652940] [2022-04-06 15:22:27,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170652940] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:27,151 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:27,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2022-04-06 15:22:27,151 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:27,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [728740357] [2022-04-06 15:22:27,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [728740357] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:27,152 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:27,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 15:22:27,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673279669] [2022-04-06 15:22:27,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:27,152 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 15:22:27,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:27,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 15:22:27,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-04-06 15:22:27,153 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-04-06 15:22:27,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:27,226 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-04-06 15:22:27,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 15:22:27,226 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 35 [2022-04-06 15:22:27,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:27,227 INFO L225 Difference]: With dead ends: 41 [2022-04-06 15:22:27,227 INFO L226 Difference]: Without dead ends: 35 [2022-04-06 15:22:27,227 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-04-06 15:22:27,228 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:27,228 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 125 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 15:22:27,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-04-06 15:22:27,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-04-06 15:22:27,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 15:22:27,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-04-06 15:22:27,234 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 35 [2022-04-06 15:22:27,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:27,235 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-04-06 15:22:27,235 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-04-06 15:22:27,235 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-04-06 15:22:27,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-04-06 15:22:27,236 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:27,236 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:27,252 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:27,451 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:27,451 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:27,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:27,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1564024736, now seen corresponding path program 3 times [2022-04-06 15:22:27,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:27,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [170025467] [2022-04-06 15:22:27,455 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:27,455 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:27,456 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:27,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1564024736, now seen corresponding path program 4 times [2022-04-06 15:22:27,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:27,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371686966] [2022-04-06 15:22:27,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:27,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:27,480 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:27,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2073606646] [2022-04-06 15:22:27,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 15:22:27,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:27,481 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:27,483 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:27,484 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 15:22:27,510 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 15:22:27,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:27,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 16 conjunts are in the unsatisfiable core [2022-04-06 15:22:27,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:27,683 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 15:22:27,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:27,812 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:27,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371686966] [2022-04-06 15:22:27,812 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:27,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073606646] [2022-04-06 15:22:27,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073606646] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:27,813 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:27,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2022-04-06 15:22:27,813 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:27,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [170025467] [2022-04-06 15:22:27,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [170025467] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:27,813 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:27,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 15:22:27,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372427326] [2022-04-06 15:22:27,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:27,813 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 15:22:27,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:27,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 15:22:27,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-04-06 15:22:27,814 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-04-06 15:22:27,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:27,897 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-04-06 15:22:27,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 15:22:27,897 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 42 [2022-04-06 15:22:27,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:27,898 INFO L225 Difference]: With dead ends: 44 [2022-04-06 15:22:27,898 INFO L226 Difference]: Without dead ends: 38 [2022-04-06 15:22:27,898 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2022-04-06 15:22:27,899 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 2 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:27,899 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 154 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:27,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-04-06 15:22:27,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-04-06 15:22:27,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 9 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 15:22:27,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-04-06 15:22:27,906 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 42 [2022-04-06 15:22:27,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:27,906 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-04-06 15:22:27,907 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-04-06 15:22:27,907 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-04-06 15:22:27,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-04-06 15:22:27,907 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:27,907 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:27,927 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:28,123 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:28,124 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:28,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:28,124 INFO L85 PathProgramCache]: Analyzing trace with hash 1951214241, now seen corresponding path program 5 times [2022-04-06 15:22:28,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:28,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [347322733] [2022-04-06 15:22:28,126 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:28,127 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:28,127 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:28,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1951214241, now seen corresponding path program 6 times [2022-04-06 15:22:28,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:28,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422966626] [2022-04-06 15:22:28,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:28,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:28,140 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:28,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1610650732] [2022-04-06 15:22:28,140 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 15:22:28,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:28,140 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:28,145 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:28,146 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 15:22:28,716 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 15:22:28,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:28,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 20 conjunts are in the unsatisfiable core [2022-04-06 15:22:28,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:28,890 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-06 15:22:28,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:29,059 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:29,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422966626] [2022-04-06 15:22:29,059 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:29,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610650732] [2022-04-06 15:22:29,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610650732] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:29,059 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:29,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-04-06 15:22:29,059 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:29,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [347322733] [2022-04-06 15:22:29,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [347322733] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:29,060 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:29,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 15:22:29,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968201072] [2022-04-06 15:22:29,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:29,060 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 15:22:29,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:29,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 15:22:29,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-04-06 15:22:29,061 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-04-06 15:22:29,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:29,163 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2022-04-06 15:22:29,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 15:22:29,164 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 49 [2022-04-06 15:22:29,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:29,165 INFO L225 Difference]: With dead ends: 47 [2022-04-06 15:22:29,165 INFO L226 Difference]: Without dead ends: 41 [2022-04-06 15:22:29,165 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2022-04-06 15:22:29,165 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 2 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:29,166 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 185 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:29,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-04-06 15:22:29,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-04-06 15:22:29,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 10 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 15:22:29,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-04-06 15:22:29,172 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 49 [2022-04-06 15:22:29,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:29,172 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-04-06 15:22:29,172 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-04-06 15:22:29,172 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-04-06 15:22:29,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-04-06 15:22:29,173 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:29,173 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:29,186 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:29,381 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:29,381 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:29,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:29,382 INFO L85 PathProgramCache]: Analyzing trace with hash 327675008, now seen corresponding path program 7 times [2022-04-06 15:22:29,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:29,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [301481475] [2022-04-06 15:22:29,384 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:29,384 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:29,384 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:29,384 INFO L85 PathProgramCache]: Analyzing trace with hash 327675008, now seen corresponding path program 8 times [2022-04-06 15:22:29,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:29,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737617037] [2022-04-06 15:22:29,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:29,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:29,391 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:29,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1278576875] [2022-04-06 15:22:29,392 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:29,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:29,392 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:29,393 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:29,394 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 15:22:29,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:22:29,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:29,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 24 conjunts are in the unsatisfiable core [2022-04-06 15:22:29,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:29,921 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-04-06 15:22:29,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:30,037 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:30,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737617037] [2022-04-06 15:22:30,038 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:30,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278576875] [2022-04-06 15:22:30,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278576875] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:30,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:30,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-04-06 15:22:30,038 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:30,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [301481475] [2022-04-06 15:22:30,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [301481475] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:30,038 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:30,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 15:22:30,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115037418] [2022-04-06 15:22:30,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:30,039 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 15:22:30,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:30,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 15:22:30,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-04-06 15:22:30,040 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-04-06 15:22:30,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:30,158 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2022-04-06 15:22:30,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 15:22:30,158 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 56 [2022-04-06 15:22:30,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:30,159 INFO L225 Difference]: With dead ends: 50 [2022-04-06 15:22:30,159 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 15:22:30,159 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-04-06 15:22:30,160 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 2 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:30,160 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 218 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:30,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 15:22:30,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-04-06 15:22:30,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 11 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-04-06 15:22:30,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2022-04-06 15:22:30,166 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 56 [2022-04-06 15:22:30,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:30,166 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2022-04-06 15:22:30,166 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-04-06 15:22:30,167 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2022-04-06 15:22:30,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-04-06 15:22:30,167 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:30,167 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:30,172 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:30,371 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:30,372 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:30,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:30,372 INFO L85 PathProgramCache]: Analyzing trace with hash -16244287, now seen corresponding path program 9 times [2022-04-06 15:22:30,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:30,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2083023628] [2022-04-06 15:22:30,381 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:30,381 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:30,381 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:30,381 INFO L85 PathProgramCache]: Analyzing trace with hash -16244287, now seen corresponding path program 10 times [2022-04-06 15:22:30,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:30,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807922755] [2022-04-06 15:22:30,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:30,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:30,387 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:30,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1915504515] [2022-04-06 15:22:30,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 15:22:30,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:30,388 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:30,389 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:30,390 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 15:22:30,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 15:22:30,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:30,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 28 conjunts are in the unsatisfiable core [2022-04-06 15:22:30,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:30,601 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 14 proven. 45 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-04-06 15:22:30,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:30,762 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:30,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807922755] [2022-04-06 15:22:30,762 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:30,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915504515] [2022-04-06 15:22:30,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915504515] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:30,762 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:30,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-04-06 15:22:30,763 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:30,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2083023628] [2022-04-06 15:22:30,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2083023628] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:30,763 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:30,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 15:22:30,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744723223] [2022-04-06 15:22:30,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:30,763 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 15:22:30,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:30,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 15:22:30,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-04-06 15:22:30,764 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2022-04-06 15:22:30,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:30,898 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2022-04-06 15:22:30,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 15:22:30,898 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 63 [2022-04-06 15:22:30,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:30,899 INFO L225 Difference]: With dead ends: 53 [2022-04-06 15:22:30,899 INFO L226 Difference]: Without dead ends: 47 [2022-04-06 15:22:30,899 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-04-06 15:22:30,900 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 2 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:30,900 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 253 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:30,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-04-06 15:22:30,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-04-06 15:22:30,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 12 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 15:22:30,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2022-04-06 15:22:30,906 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 63 [2022-04-06 15:22:30,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:30,906 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2022-04-06 15:22:30,906 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2022-04-06 15:22:30,907 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2022-04-06 15:22:30,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-04-06 15:22:30,907 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:30,907 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:30,926 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:31,119 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:31,122 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:31,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:31,122 INFO L85 PathProgramCache]: Analyzing trace with hash 570339680, now seen corresponding path program 11 times [2022-04-06 15:22:31,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:31,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [577103338] [2022-04-06 15:22:31,124 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:31,124 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:31,124 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:31,125 INFO L85 PathProgramCache]: Analyzing trace with hash 570339680, now seen corresponding path program 12 times [2022-04-06 15:22:31,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:31,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254148212] [2022-04-06 15:22:31,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:31,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:31,131 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:31,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [434906362] [2022-04-06 15:22:31,131 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 15:22:31,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:31,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:31,132 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:31,133 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 15:22:31,915 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 15:22:31,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:31,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-06 15:22:31,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:32,165 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 16 proven. 63 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 15:22:32,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:32,296 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:32,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254148212] [2022-04-06 15:22:32,296 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:32,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434906362] [2022-04-06 15:22:32,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434906362] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:32,296 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:32,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2022-04-06 15:22:32,297 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:32,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [577103338] [2022-04-06 15:22:32,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [577103338] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:32,297 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:32,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 15:22:32,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975050550] [2022-04-06 15:22:32,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:32,297 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 15:22:32,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:32,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 15:22:32,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-04-06 15:22:32,298 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-04-06 15:22:32,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:32,482 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2022-04-06 15:22:32,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 15:22:32,483 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 70 [2022-04-06 15:22:32,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:32,483 INFO L225 Difference]: With dead ends: 56 [2022-04-06 15:22:32,483 INFO L226 Difference]: Without dead ends: 50 [2022-04-06 15:22:32,484 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2022-04-06 15:22:32,484 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 2 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:32,484 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 290 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:22:32,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-06 15:22:32,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-04-06 15:22:32,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 13 states have call successors, (13), 6 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-04-06 15:22:32,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-04-06 15:22:32,491 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 70 [2022-04-06 15:22:32,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:32,491 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-04-06 15:22:32,491 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-04-06 15:22:32,491 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-04-06 15:22:32,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-04-06 15:22:32,492 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:32,492 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:32,497 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-04-06 15:22:32,697 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-04-06 15:22:32,697 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:32,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:32,697 INFO L85 PathProgramCache]: Analyzing trace with hash 724836577, now seen corresponding path program 13 times [2022-04-06 15:22:32,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:32,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1039307541] [2022-04-06 15:22:32,699 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:32,700 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:32,700 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:32,700 INFO L85 PathProgramCache]: Analyzing trace with hash 724836577, now seen corresponding path program 14 times [2022-04-06 15:22:32,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:32,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040251125] [2022-04-06 15:22:32,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:32,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:32,707 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:32,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1401204417] [2022-04-06 15:22:32,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:22:32,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:32,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:32,708 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:32,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 15:22:33,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:22:33,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:33,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 53 conjunts are in the unsatisfiable core [2022-04-06 15:22:33,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:33,763 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 63 proven. 93 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-04-06 15:22:33,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:47,093 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:47,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040251125] [2022-04-06 15:22:47,094 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:47,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401204417] [2022-04-06 15:22:47,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401204417] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:47,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:47,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-04-06 15:22:47,094 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:47,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1039307541] [2022-04-06 15:22:47,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1039307541] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:47,094 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:47,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 15:22:47,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165368289] [2022-04-06 15:22:47,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:47,095 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 15:22:47,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:47,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 15:22:47,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=466, Unknown=2, NotChecked=0, Total=552 [2022-04-06 15:22:47,095 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 18 states, 16 states have (on average 2.0) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2022-04-06 15:22:47,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:47,408 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2022-04-06 15:22:47,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-04-06 15:22:47,409 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.0) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 77 [2022-04-06 15:22:47,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:47,410 INFO L225 Difference]: With dead ends: 63 [2022-04-06 15:22:47,410 INFO L226 Difference]: Without dead ends: 57 [2022-04-06 15:22:47,410 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=105, Invalid=595, Unknown=2, NotChecked=0, Total=702 [2022-04-06 15:22:47,411 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 11 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:47,411 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 329 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 15:22:47,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-04-06 15:22:47,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-04-06 15:22:47,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 15:22:47,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2022-04-06 15:22:47,418 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 77 [2022-04-06 15:22:47,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:47,418 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2022-04-06 15:22:47,418 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.0) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2022-04-06 15:22:47,418 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2022-04-06 15:22:47,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-04-06 15:22:47,419 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:47,419 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:47,427 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:47,624 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-04-06 15:22:47,624 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:47,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:47,624 INFO L85 PathProgramCache]: Analyzing trace with hash 1196125760, now seen corresponding path program 15 times [2022-04-06 15:22:47,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:47,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [74169784] [2022-04-06 15:22:47,627 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:47,627 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:47,627 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:47,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1196125760, now seen corresponding path program 16 times [2022-04-06 15:22:47,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:47,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661464964] [2022-04-06 15:22:47,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:47,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:47,634 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:47,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1436988931] [2022-04-06 15:22:47,634 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 15:22:47,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:47,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:47,643 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:47,649 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 15:22:47,682 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 15:22:47,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:47,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 40 conjunts are in the unsatisfiable core [2022-04-06 15:22:47,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:47,941 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 20 proven. 108 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-04-06 15:22:47,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:22:48,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:22:48,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661464964] [2022-04-06 15:22:48,068 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:22:48,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436988931] [2022-04-06 15:22:48,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436988931] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:22:48,068 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:22:48,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-04-06 15:22:48,069 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:22:48,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [74169784] [2022-04-06 15:22:48,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [74169784] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:22:48,069 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:22:48,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 15:22:48,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665108713] [2022-04-06 15:22:48,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:22:48,069 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 15:22:48,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:48,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 15:22:48,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-04-06 15:22:48,070 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2022-04-06 15:22:48,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:22:48,305 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2022-04-06 15:22:48,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 15:22:48,305 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 84 [2022-04-06 15:22:48,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:22:48,306 INFO L225 Difference]: With dead ends: 66 [2022-04-06 15:22:48,306 INFO L226 Difference]: Without dead ends: 60 [2022-04-06 15:22:48,306 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2022-04-06 15:22:48,307 INFO L913 BasicCegarLoop]: 49 mSDtfsCounter, 2 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 15:22:48,307 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 370 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 15:22:48,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-04-06 15:22:48,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-04-06 15:22:48,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 15 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-06 15:22:48,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2022-04-06 15:22:48,314 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 84 [2022-04-06 15:22:48,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:22:48,315 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2022-04-06 15:22:48,315 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2022-04-06 15:22:48,315 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2022-04-06 15:22:48,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-04-06 15:22:48,315 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:22:48,316 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:22:48,360 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 15:22:48,516 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-04-06 15:22:48,516 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:22:48,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:22:48,516 INFO L85 PathProgramCache]: Analyzing trace with hash -94164991, now seen corresponding path program 17 times [2022-04-06 15:22:48,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:22:48,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1989138809] [2022-04-06 15:22:48,518 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:22:48,519 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:22:48,519 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:22:48,519 INFO L85 PathProgramCache]: Analyzing trace with hash -94164991, now seen corresponding path program 18 times [2022-04-06 15:22:48,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:22:48,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502658317] [2022-04-06 15:22:48,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:22:48,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:22:48,526 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:22:48,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [899481239] [2022-04-06 15:22:48,526 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 15:22:48,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:22:48,527 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:22:48,527 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:22:48,539 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 15:22:49,122 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-04-06 15:22:49,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:22:49,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 55 conjunts are in the unsatisfiable core [2022-04-06 15:22:49,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:22:49,519 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 68 proven. 143 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2022-04-06 15:22:49,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:23:16,829 WARN L232 SmtUtils]: Spent 6.07s on a formula simplification that was a NOOP. DAG size: 45 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 15:23:20,917 WARN L833 $PredicateComparison]: unable to prove that (or (not (= (mod (+ (* (- 2) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0) (* (- 5) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0) (* (- 6) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0) (* c_main_~y~0 c_main_~y~0)) 12) 0)) (forall ((main_~k~0 Int)) (or (< (+ c_main_~c~0 1) main_~k~0) (not (< c_main_~c~0 main_~k~0)) (let ((.cse0 (+ c_main_~y~0 1))) (= (* .cse0 .cse0) (* main_~k~0 .cse0)))))) is different from false [2022-04-06 15:23:20,919 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:23:20,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502658317] [2022-04-06 15:23:20,919 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 15:23:20,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899481239] [2022-04-06 15:23:20,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899481239] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:23:20,920 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:23:20,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-04-06 15:23:20,920 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:23:20,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1989138809] [2022-04-06 15:23:20,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1989138809] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:23:20,920 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:23:20,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-04-06 15:23:20,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874219190] [2022-04-06 15:23:20,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:23:20,920 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-06 15:23:20,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:23:20,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-06 15:23:20,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=4, NotChecked=44, Total=600 [2022-04-06 15:23:20,921 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2022-04-06 15:23:21,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:23:21,320 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2022-04-06 15:23:21,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-06 15:23:21,321 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) Word has length 91 [2022-04-06 15:23:21,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:23:21,321 INFO L225 Difference]: With dead ends: 69 [2022-04-06 15:23:21,321 INFO L226 Difference]: Without dead ends: 63 [2022-04-06 15:23:21,322 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=97, Invalid=605, Unknown=4, NotChecked=50, Total=756 [2022-04-06 15:23:21,322 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 15:23:21,322 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 393 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 15:23:21,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-04-06 15:23:21,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-04-06 15:23:21,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 16 states have call successors, (16), 7 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-04-06 15:23:21,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2022-04-06 15:23:21,334 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 91 [2022-04-06 15:23:21,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:23:21,334 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2022-04-06 15:23:21,334 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2022-04-06 15:23:21,334 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2022-04-06 15:23:21,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-04-06 15:23:21,335 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:23:21,335 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 15:23:21,342 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 15:23:21,535 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-04-06 15:23:21,535 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:23:21,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:23:21,536 INFO L85 PathProgramCache]: Analyzing trace with hash -107207904, now seen corresponding path program 19 times [2022-04-06 15:23:21,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:23:21,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1686238357] [2022-04-06 15:23:21,538 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 15:23:21,538 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2022-04-06 15:23:21,538 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 15:23:21,538 INFO L85 PathProgramCache]: Analyzing trace with hash -107207904, now seen corresponding path program 20 times [2022-04-06 15:23:21,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:23:21,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834079206] [2022-04-06 15:23:21,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:23:21,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:23:21,544 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 15:23:21,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [951014662] [2022-04-06 15:23:21,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:23:21,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:23:21,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:23:21,546 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:23:21,547 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process