/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/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 01:43:19,064 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 01:43:19,066 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 01:43:19,134 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-18 01:43:19,134 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-18 01:43:19,135 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-18 01:43:19,137 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-18 01:43:19,141 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-18 01:43:19,142 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-18 01:43:19,145 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-18 01:43:19,146 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-18 01:43:19,146 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-18 01:43:19,147 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-18 01:43:19,147 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-18 01:43:19,148 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-18 01:43:19,148 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-18 01:43:19,149 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-18 01:43:19,149 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-18 01:43:19,150 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-18 01:43:19,151 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-18 01:43:19,152 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-18 01:43:19,154 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-18 01:43:19,155 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-18 01:43:19,157 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-18 01:43:19,158 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-18 01:43:19,166 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-18 01:43:19,166 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-18 01:43:19,166 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-18 01:43:19,167 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-18 01:43:19,167 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-18 01:43:19,168 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-18 01:43:19,168 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-18 01:43:19,169 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-18 01:43:19,169 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-18 01:43:19,170 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-18 01:43:19,171 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-18 01:43:19,171 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-18 01:43:19,171 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-18 01:43:19,172 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-18 01:43:19,172 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 01:43:19,172 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 01:43:19,174 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 01:43:19,175 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 01:43:19,182 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 01:43:19,183 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 01:43:19,184 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 01:43:19,184 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 01:43:19,184 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 01:43:19,184 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 01:43:19,184 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 01:43:19,185 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 01:43:19,185 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 01:43:19,185 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 01:43:19,185 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 01:43:19,186 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 01:43:19,186 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 01:43:19,186 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 01:43:19,186 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 01:43:19,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 01:43:19,186 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 01:43:19,186 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 01:43:19,186 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 01:43:19,186 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 01:43:19,187 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 01:43:19,187 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 01:43:19,187 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 01:43:19,396 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 01:43:19,417 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 01:43:19,418 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 01:43:19,419 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 01:43:19,419 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 01:43:19,420 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound20.c [2022-03-18 01:43:19,467 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ab260c85d/ff029b81433e4cd5b004c5e20f469b2a/FLAG0652f6e8e [2022-03-18 01:43:19,765 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 01:43:19,766 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound20.c [2022-03-18 01:43:19,770 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ab260c85d/ff029b81433e4cd5b004c5e20f469b2a/FLAG0652f6e8e [2022-03-18 01:43:20,191 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ab260c85d/ff029b81433e4cd5b004c5e20f469b2a [2022-03-18 01:43:20,193 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 01:43:20,194 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 01:43:20,195 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 01:43:20,195 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 01:43:20,200 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 01:43:20,201 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,202 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ec849f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20, skipping insertion in model container [2022-03-18 01:43:20,202 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,207 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 01:43:20,220 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 01:43:20,370 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound20.c[588,601] [2022-03-18 01:43:20,402 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 01:43:20,407 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 01:43:20,414 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound20.c[588,601] [2022-03-18 01:43:20,435 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 01:43:20,442 INFO L208 MainTranslator]: Completed translation [2022-03-18 01:43:20,443 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20 WrapperNode [2022-03-18 01:43:20,443 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 01:43:20,444 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 01:43:20,444 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 01:43:20,444 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 01:43:20,452 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,452 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,467 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,467 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,483 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,485 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,486 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,487 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 01:43:20,487 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 01:43:20,487 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 01:43:20,488 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 01:43:20,488 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (1/1) ... [2022-03-18 01:43:20,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 01:43:20,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:43:20,516 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 01:43:20,533 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 01:43:20,547 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 01:43:20,548 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 01:43:20,548 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 01:43:20,548 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 01:43:20,548 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 01:43:20,548 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 01:43:20,549 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 01:43:20,549 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 01:43:20,549 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 01:43:20,549 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 01:43:20,549 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ushort [2022-03-18 01:43:20,549 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 01:43:20,550 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 01:43:20,550 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 01:43:20,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 01:43:20,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 01:43:20,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 01:43:20,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 01:43:20,552 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 01:43:20,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 01:43:20,595 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 01:43:20,596 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 01:43:20,681 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 01:43:20,685 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 01:43:20,685 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 01:43:20,686 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 01:43:20 BoogieIcfgContainer [2022-03-18 01:43:20,686 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 01:43:20,687 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 01:43:20,687 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 01:43:20,690 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 01:43:20,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 01:43:20" (1/3) ... [2022-03-18 01:43:20,690 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28bccd0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 01:43:20, skipping insertion in model container [2022-03-18 01:43:20,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:43:20" (2/3) ... [2022-03-18 01:43:20,691 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28bccd0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 01:43:20, skipping insertion in model container [2022-03-18 01:43:20,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 01:43:20" (3/3) ... [2022-03-18 01:43:20,691 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_valuebound20.c [2022-03-18 01:43:20,694 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 01:43:20,695 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 01:43:20,720 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 01:43:20,724 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 [2022-03-18 01:43:20,724 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 01:43:20,733 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 01:43:20,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 01:43:20,738 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:43:20,738 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:43:20,738 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:43:20,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:43:20,742 INFO L85 PathProgramCache]: Analyzing trace with hash 503189915, now seen corresponding path program 1 times [2022-03-18 01:43:20,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:20,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2804656] [2022-03-18 01:43:20,753 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:43:20,754 INFO L85 PathProgramCache]: Analyzing trace with hash 503189915, now seen corresponding path program 2 times [2022-03-18 01:43:20,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:43:20,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208660687] [2022-03-18 01:43:20,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:43:20,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:43:20,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:43:20,913 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:43:20,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:43:20,924 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 01:43:20,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:43:20,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:43:20,938 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:43:20,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208660687] [2022-03-18 01:43:20,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208660687] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:20,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:20,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 01:43:20,940 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:43:20,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2804656] [2022-03-18 01:43:20,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2804656] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:20,941 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:20,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 01:43:20,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129168476] [2022-03-18 01:43:20,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:43:20,944 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 01:43:20,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:20,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 01:43:20,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 01:43:20,972 INFO L87 Difference]: Start difference. First operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) 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) [2022-03-18 01:43:21,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:43:21,087 INFO L93 Difference]: Finished difference Result 63 states and 101 transitions. [2022-03-18 01:43:21,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 01:43:21,090 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 [2022-03-18 01:43:21,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:43:21,097 INFO L225 Difference]: With dead ends: 63 [2022-03-18 01:43:21,097 INFO L226 Difference]: Without dead ends: 31 [2022-03-18 01:43:21,100 INFO L911 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 [2022-03-18 01:43:21,102 INFO L912 BasicCegarLoop]: 34 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:43:21,102 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 37 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 01:43:21,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-18 01:43:21,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-18 01:43:21,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 01:43:21,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-03-18 01:43:21,138 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 17 [2022-03-18 01:43:21,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:43:21,138 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-03-18 01:43:21,139 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) [2022-03-18 01:43:21,139 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-03-18 01:43:21,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 01:43:21,140 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:43:21,140 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:43:21,140 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 01:43:21,140 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:43:21,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:43:21,142 INFO L85 PathProgramCache]: Analyzing trace with hash 1171868123, now seen corresponding path program 1 times [2022-03-18 01:43:21,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:21,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1176344696] [2022-03-18 01:43:21,147 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:43:21,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1171868123, now seen corresponding path program 2 times [2022-03-18 01:43:21,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:43:21,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437348631] [2022-03-18 01:43:21,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:43:21,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:43:21,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:43:21,272 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:43:21,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:43:21,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 01:43:21,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:43:21,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:43:21,299 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:43:21,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437348631] [2022-03-18 01:43:21,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437348631] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:21,299 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:21,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 01:43:21,300 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:43:21,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1176344696] [2022-03-18 01:43:21,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1176344696] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:21,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:21,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 01:43:21,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888440657] [2022-03-18 01:43:21,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:43:21,301 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 01:43:21,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:21,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 01:43:21,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:43:21,301 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 01:43:21,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:43:21,436 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2022-03-18 01:43:21,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 01:43:21,437 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-18 01:43:21,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:43:21,437 INFO L225 Difference]: With dead ends: 37 [2022-03-18 01:43:21,438 INFO L226 Difference]: Without dead ends: 35 [2022-03-18 01:43:21,438 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 01:43:21,439 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 22 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:43:21,439 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 43 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 01:43:21,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-18 01:43:21,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-18 01:43:21,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 01:43:21,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2022-03-18 01:43:21,461 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 17 [2022-03-18 01:43:21,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:43:21,461 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2022-03-18 01:43:21,461 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 01:43:21,461 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2022-03-18 01:43:21,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-18 01:43:21,462 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:43:21,462 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:43:21,462 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 01:43:21,462 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:43:21,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:43:21,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1781524074, now seen corresponding path program 1 times [2022-03-18 01:43:21,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:21,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1229204618] [2022-03-18 01:43:21,463 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:43:21,463 INFO L85 PathProgramCache]: Analyzing trace with hash -1781524074, now seen corresponding path program 2 times [2022-03-18 01:43:21,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:43:21,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426968105] [2022-03-18 01:43:21,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:43:21,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:43:21,488 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:43:21,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [300170884] [2022-03-18 01:43:21,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 01:43:21,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:43:21,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:43:21,500 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 01:43:21,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 01:43:21,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 01:43:21,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 01:43:21,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 01:43:21,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:43:21,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:43:21,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 01:43:21,661 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:43:21,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426968105] [2022-03-18 01:43:21,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:43:21,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300170884] [2022-03-18 01:43:21,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300170884] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:21,662 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:21,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:43:21,662 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:43:21,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1229204618] [2022-03-18 01:43:21,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1229204618] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:21,663 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:21,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:43:21,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135890268] [2022-03-18 01:43:21,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:43:21,663 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 01:43:21,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:21,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 01:43:21,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:43:21,664 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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) [2022-03-18 01:43:21,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:43:21,705 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2022-03-18 01:43:21,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 01:43:21,705 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 22 [2022-03-18 01:43:21,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:43:21,706 INFO L225 Difference]: With dead ends: 54 [2022-03-18 01:43:21,706 INFO L226 Difference]: Without dead ends: 52 [2022-03-18 01:43:21,706 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:43:21,707 INFO L912 BasicCegarLoop]: 49 mSDtfsCounter, 6 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:43:21,708 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 168 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:43:21,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-18 01:43:21,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2022-03-18 01:43:21,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 20 states have (on average 1.1) internal successors, (22), 22 states have internal predecessors, (22), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 01:43:21,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2022-03-18 01:43:21,717 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 22 [2022-03-18 01:43:21,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:43:21,717 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2022-03-18 01:43:21,718 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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) [2022-03-18 01:43:21,718 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2022-03-18 01:43:21,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 01:43:21,718 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:43:21,718 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:43:21,743 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 01:43:21,931 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:43:21,931 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:43:21,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:43:21,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1241120379, now seen corresponding path program 1 times [2022-03-18 01:43:21,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:21,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [202025676] [2022-03-18 01:43:21,933 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:43:21,933 INFO L85 PathProgramCache]: Analyzing trace with hash 1241120379, now seen corresponding path program 2 times [2022-03-18 01:43:21,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:43:21,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061167092] [2022-03-18 01:43:21,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:43:21,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:43:21,946 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:43:21,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1860168808] [2022-03-18 01:43:21,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 01:43:21,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:43:21,947 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:43:21,948 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 01:43:21,949 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 01:43:21,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 01:43:21,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 01:43:21,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 01:43:21,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:43:22,075 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 01:43:22,076 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 01:43:22,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:43:22,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061167092] [2022-03-18 01:43:22,076 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:43:22,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860168808] [2022-03-18 01:43:22,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860168808] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:22,077 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:22,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:43:22,077 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:43:22,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [202025676] [2022-03-18 01:43:22,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [202025676] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:22,077 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:22,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:43:22,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509106352] [2022-03-18 01:43:22,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:43:22,078 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 01:43:22,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:22,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 01:43:22,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:43:22,079 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 01:43:22,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:43:22,143 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2022-03-18 01:43:22,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 01:43:22,147 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2022-03-18 01:43:22,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:43:22,149 INFO L225 Difference]: With dead ends: 58 [2022-03-18 01:43:22,149 INFO L226 Difference]: Without dead ends: 56 [2022-03-18 01:43:22,150 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:43:22,150 INFO L912 BasicCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:43:22,151 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 165 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:43:22,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-18 01:43:22,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2022-03-18 01:43:22,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 24 states have (on average 1.125) internal successors, (27), 26 states have internal predecessors, (27), 21 states have call successors, (21), 7 states have call predecessors, (21), 6 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-18 01:43:22,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-03-18 01:43:22,162 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 27 [2022-03-18 01:43:22,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:43:22,162 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-03-18 01:43:22,162 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 01:43:22,162 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-03-18 01:43:22,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-18 01:43:22,163 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:43:22,163 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:43:22,181 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-18 01:43:22,374 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-03-18 01:43:22,374 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:43:22,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:43:22,375 INFO L85 PathProgramCache]: Analyzing trace with hash 1598126198, now seen corresponding path program 1 times [2022-03-18 01:43:22,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:22,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2134143279] [2022-03-18 01:43:22,377 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:43:22,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1598126198, now seen corresponding path program 2 times [2022-03-18 01:43:22,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:43:22,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053927695] [2022-03-18 01:43:22,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:43:22,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:43:22,416 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:43:22,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1355070271] [2022-03-18 01:43:22,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 01:43:22,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:43:22,417 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:43:22,424 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 01:43:22,425 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 01:43:22,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 01:43:22,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 01:43:22,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-18 01:43:22,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:43:22,543 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 01:43:22,543 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 01:43:22,543 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:43:22,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053927695] [2022-03-18 01:43:22,544 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:43:22,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355070271] [2022-03-18 01:43:22,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355070271] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:22,544 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:22,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:43:22,544 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:43:22,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2134143279] [2022-03-18 01:43:22,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2134143279] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:43:22,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:43:22,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:43:22,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174419616] [2022-03-18 01:43:22,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:43:22,545 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 01:43:22,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:22,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 01:43:22,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:43:22,546 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 01:43:22,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:43:22,593 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2022-03-18 01:43:22,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 01:43:22,594 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2022-03-18 01:43:22,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:43:22,595 INFO L225 Difference]: With dead ends: 66 [2022-03-18 01:43:22,595 INFO L226 Difference]: Without dead ends: 54 [2022-03-18 01:43:22,595 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:43:22,596 INFO L912 BasicCegarLoop]: 45 mSDtfsCounter, 6 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:43:22,596 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 157 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:43:22,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-18 01:43:22,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-18 01:43:22,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 28 states have internal predecessors, (29), 19 states have call successors, (19), 8 states have call predecessors, (19), 7 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 01:43:22,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2022-03-18 01:43:22,605 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 32 [2022-03-18 01:43:22,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:43:22,605 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2022-03-18 01:43:22,605 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 01:43:22,605 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2022-03-18 01:43:22,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-18 01:43:22,606 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:43:22,606 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:43:22,622 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 01:43:22,819 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:43:22,820 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:43:22,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:43:22,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1002403483, now seen corresponding path program 1 times [2022-03-18 01:43:22,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:43:22,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2035469045] [2022-03-18 01:43:58,182 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:43:58,183 INFO L85 PathProgramCache]: Analyzing trace with hash -1018400594, now seen corresponding path program 1 times [2022-03-18 01:43:58,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:43:58,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103788856] [2022-03-18 01:43:58,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:43:58,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:43:58,190 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:43:58,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2004140482] [2022-03-18 01:43:58,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:43:58,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:43:58,190 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:43:58,191 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 01:43:58,192 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 01:43:58,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:43:58,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-18 01:43:58,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:43:58,391 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:43:58,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 01:43:58,493 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:43:58,494 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:43:58,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103788856] [2022-03-18 01:43:58,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:43:58,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004140482] [2022-03-18 01:43:58,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004140482] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 01:43:58,494 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 01:43:58,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2022-03-18 01:44:51,544 WARN L232 SmtUtils]: Spent 6.05s on a formula simplification. DAG size of input: 28 DAG size of output: 23 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 01:45:17,255 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:45:17,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2035469045] [2022-03-18 01:45:17,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2035469045] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:45:17,255 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:45:17,256 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-18 01:45:17,256 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966576445] [2022-03-18 01:45:17,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:45:17,256 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-18 01:45:17,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:45:17,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-18 01:45:17,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=973, Unknown=27, NotChecked=0, Total=1190 [2022-03-18 01:45:17,257 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 29 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 17 states have internal predecessors, (31), 8 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-03-18 01:45:28,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:45:28,791 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2022-03-18 01:45:28,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-18 01:45:28,792 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 17 states have internal predecessors, (31), 8 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 49 [2022-03-18 01:45:28,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:45:28,794 INFO L225 Difference]: With dead ends: 80 [2022-03-18 01:45:28,794 INFO L226 Difference]: Without dead ends: 78 [2022-03-18 01:45:28,794 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 43 SyntacticMatches, 7 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 89.8s TimeCoverageRelationStatistics Valid=266, Invalid=1426, Unknown=30, NotChecked=0, Total=1722 [2022-03-18 01:45:28,795 INFO L912 BasicCegarLoop]: 33 mSDtfsCounter, 27 mSDsluCounter, 359 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 01:45:28,795 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 392 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 93 Invalid, 0 Unknown, 118 Unchecked, 0.3s Time] [2022-03-18 01:45:28,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-18 01:45:28,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2022-03-18 01:45:28,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 19 states have call successors, (19), 14 states have call predecessors, (19), 12 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 01:45:28,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 85 transitions. [2022-03-18 01:45:28,818 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 85 transitions. Word has length 49 [2022-03-18 01:45:28,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:45:28,819 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 85 transitions. [2022-03-18 01:45:28,819 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 17 states have internal predecessors, (31), 8 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-03-18 01:45:28,820 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 85 transitions. [2022-03-18 01:45:28,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-18 01:45:28,821 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:45:28,821 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:45:28,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 01:45:29,039 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:45:29,040 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:45:29,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:45:29,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1130038122, now seen corresponding path program 2 times [2022-03-18 01:45:29,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:45:29,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [247476644] [2022-03-18 01:50:32,472 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:50:32,473 INFO L85 PathProgramCache]: Analyzing trace with hash 1063970467, now seen corresponding path program 1 times [2022-03-18 01:50:32,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:50:32,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233980384] [2022-03-18 01:50:32,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:50:32,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:50:32,493 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:50:32,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [409624131] [2022-03-18 01:50:32,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:50:32,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:50:32,493 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:50:32,504 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 01:50:32,505 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 01:50:32,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:50:32,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-18 01:50:32,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:50:32,745 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-18 01:50:32,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 01:50:34,893 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-18 01:50:34,893 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:50:34,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233980384] [2022-03-18 01:50:34,893 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:50:34,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409624131] [2022-03-18 01:50:34,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409624131] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 01:50:34,894 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 01:50:34,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2022-03-18 01:51:46,079 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:51:46,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [247476644] [2022-03-18 01:51:46,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [247476644] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:51:46,079 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:51:46,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-18 01:51:46,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730565309] [2022-03-18 01:51:46,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:51:46,080 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-18 01:51:46,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:51:46,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-18 01:51:46,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1058, Unknown=28, NotChecked=0, Total=1260 [2022-03-18 01:51:46,081 INFO L87 Difference]: Start difference. First operand 76 states and 85 transitions. Second operand has 30 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 8 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2022-03-18 01:51:48,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:51:48,544 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2022-03-18 01:51:48,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-18 01:51:48,545 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 8 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) Word has length 54 [2022-03-18 01:51:48,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:51:48,545 INFO L225 Difference]: With dead ends: 80 [2022-03-18 01:51:48,545 INFO L226 Difference]: Without dead ends: 78 [2022-03-18 01:51:48,546 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 75.3s TimeCoverageRelationStatistics Valid=248, Invalid=1529, Unknown=29, NotChecked=0, Total=1806 [2022-03-18 01:51:48,547 INFO L912 BasicCegarLoop]: 34 mSDtfsCounter, 34 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:51:48,547 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 410 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 78 Invalid, 0 Unknown, 75 Unchecked, 0.1s Time] [2022-03-18 01:51:48,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-18 01:51:48,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-03-18 01:51:48,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 46 states have internal predecessors, (49), 19 states have call successors, (19), 14 states have call predecessors, (19), 13 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 01:51:48,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2022-03-18 01:51:48,570 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 54 [2022-03-18 01:51:48,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:51:48,570 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2022-03-18 01:51:48,570 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 8 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2022-03-18 01:51:48,570 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2022-03-18 01:51:48,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-18 01:51:48,571 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:51:48,571 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:51:48,591 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-18 01:51:48,790 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:51:48,791 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:51:48,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:51:48,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1546120389, now seen corresponding path program 3 times [2022-03-18 01:51:48,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:51:48,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [767963568] [2022-03-18 01:54:44,405 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: cannot divide by 0! [2022-03-18 01:54:44,405 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-18 01:54:44,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1546120389, now seen corresponding path program 4 times [2022-03-18 01:54:44,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:54:44,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197317355] [2022-03-18 01:54:44,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:54:44,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:54:44,425 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 01:54:44,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1927347110] [2022-03-18 01:54:44,426 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 01:54:44,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:54:44,426 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:54:44,430 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 01:54:44,431 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 01:54:44,470 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 01:54:44,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 01:54:44,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-18 01:54:44,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 01:54:44,626 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-03-18 01:54:44,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 01:54:44,860 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-03-18 01:54:44,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:54:44,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197317355] [2022-03-18 01:54:44,861 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 01:54:44,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927347110] [2022-03-18 01:54:44,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927347110] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 01:54:44,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 01:54:44,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-03-18 01:54:44,862 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:54:44,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [767963568] [2022-03-18 01:54:44,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [767963568] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:54:44,862 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:54:44,862 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 01:54:44,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424042466] [2022-03-18 01:54:44,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:54:44,862 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 01:54:44,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:54:44,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 01:54:44,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-18 01:54:44,863 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-03-18 01:54:44,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:54:44,945 INFO L93 Difference]: Finished difference Result 105 states and 122 transitions. [2022-03-18 01:54:44,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 01:54:44,945 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 59 [2022-03-18 01:54:44,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:54:44,946 INFO L225 Difference]: With dead ends: 105 [2022-03-18 01:54:44,946 INFO L226 Difference]: Without dead ends: 96 [2022-03-18 01:54:44,946 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-03-18 01:54:44,947 INFO L912 BasicCegarLoop]: 50 mSDtfsCounter, 6 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:54:44,947 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 215 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 01:54:44,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-03-18 01:54:44,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2022-03-18 01:54:44,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 55 states have internal predecessors, (58), 27 states have call successors, (27), 16 states have call predecessors, (27), 15 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2022-03-18 01:54:44,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 109 transitions. [2022-03-18 01:54:44,963 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 109 transitions. Word has length 59 [2022-03-18 01:54:44,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:54:44,963 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 109 transitions. [2022-03-18 01:54:44,963 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-03-18 01:54:44,963 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 109 transitions. [2022-03-18 01:54:44,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-18 01:54:44,964 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:54:44,964 INFO L500 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:54:44,980 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 01:54:45,180 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 01:54:45,180 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:54:45,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:54:45,181 INFO L85 PathProgramCache]: Analyzing trace with hash -310331719, now seen corresponding path program 1 times [2022-03-18 01:54:45,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:54:45,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [570949122]