/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/ps6-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 21:25:36,045 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 21:25:36,046 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 21:25:36,066 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-06 21:25:36,067 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-06 21:25:36,067 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-06 21:25:36,068 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-06 21:25:36,069 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-06 21:25:36,070 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-06 21:25:36,071 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-06 21:25:36,074 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-06 21:25:36,076 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-06 21:25:36,076 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 21:25:36,079 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 21:25:36,080 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 21:25:36,082 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 21:25:36,083 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 21:25:36,084 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 21:25:36,089 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 21:25:36,092 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 21:25:36,093 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 21:25:36,094 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 21:25:36,094 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 21:25:36,095 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 21:25:36,095 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 21:25:36,097 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-04-06 21:25:36,097 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-04-06 21:25:36,097 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-04-06 21:25:36,097 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-04-06 21:25:36,097 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-04-06 21:25:36,098 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-04-06 21:25:36,098 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-04-06 21:25:36,099 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-04-06 21:25:36,099 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-04-06 21:25:36,100 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-04-06 21:25:36,100 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-04-06 21:25:36,101 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-04-06 21:25:36,101 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-04-06 21:25:36,101 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-04-06 21:25:36,101 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 21:25:36,102 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 21:25:36,112 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 21:25:36,113 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-04-06 21:25:36,122 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 21:25:36,122 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 21:25:36,124 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 21:25:36,124 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 21:25:36,124 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 21:25:36,124 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 21:25:36,124 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 21:25:36,124 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 21:25:36,124 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 21:25:36,125 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 21:25:36,125 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 21:25:36,125 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 21:25:36,125 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 21:25:36,126 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 21:25:36,126 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 21:25:36,126 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 21:25:36,126 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 21:25:36,126 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 21:25:36,127 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 21:25:36,127 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 21:25:36,130 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 21:25:36,130 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-04-06 21:25:36,130 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 21:25:36,290 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 21:25:36,304 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 21:25:36,306 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 21:25:36,307 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 21:25:36,307 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 21:25:36,308 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps6-ll.c [2022-04-06 21:25:36,357 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/71f5f3f1f/a23a73aaa224402699ea0e672b98bf49/FLAG2285b80e5 [2022-04-06 21:25:36,689 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 21:25:36,689 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps6-ll.c [2022-04-06 21:25:36,693 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/71f5f3f1f/a23a73aaa224402699ea0e672b98bf49/FLAG2285b80e5 [2022-04-06 21:25:37,145 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/71f5f3f1f/a23a73aaa224402699ea0e672b98bf49 [2022-04-06 21:25:37,147 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 21:25:37,148 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 21:25:37,149 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 21:25:37,149 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 21:25:37,162 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 21:25:37,162 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,163 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9f109f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37, skipping insertion in model container [2022-04-06 21:25:37,163 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,167 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 21:25:37,176 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 21:25:37,293 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps6-ll.c[458,471] [2022-04-06 21:25:37,314 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 21:25:37,320 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 21:25:37,329 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps6-ll.c[458,471] [2022-04-06 21:25:37,344 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 21:25:37,353 INFO L208 MainTranslator]: Completed translation [2022-04-06 21:25:37,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37 WrapperNode [2022-04-06 21:25:37,353 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 21:25:37,355 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 21:25:37,355 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 21:25:37,355 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 21:25:37,362 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,363 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,368 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,368 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,378 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,380 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,382 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,386 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 21:25:37,387 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 21:25:37,387 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 21:25:37,387 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 21:25:37,388 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (1/1) ... [2022-04-06 21:25:37,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 21:25:37,400 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:37,409 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 21:25:37,410 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 21:25:37,430 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 21:25:37,430 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 21:25:37,430 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 21:25:37,430 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 21:25:37,430 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 21:25:37,430 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 21:25:37,430 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 21:25:37,430 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 21:25:37,431 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 21:25:37,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 21:25:37,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2022-04-06 21:25:37,431 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 21:25:37,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 21:25:37,431 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 21:25:37,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 21:25:37,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 21:25:37,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 21:25:37,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 21:25:37,433 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 21:25:37,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 21:25:37,471 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 21:25:37,472 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 21:25:37,547 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 21:25:37,551 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 21:25:37,551 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-04-06 21:25:37,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 09:25:37 BoogieIcfgContainer [2022-04-06 21:25:37,552 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 21:25:37,553 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 21:25:37,553 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 21:25:37,555 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 21:25:37,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 09:25:37" (1/3) ... [2022-04-06 21:25:37,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39844805 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 09:25:37, skipping insertion in model container [2022-04-06 21:25:37,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:37" (2/3) ... [2022-04-06 21:25:37,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39844805 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 09:25:37, skipping insertion in model container [2022-04-06 21:25:37,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 09:25:37" (3/3) ... [2022-04-06 21:25:37,557 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll.c [2022-04-06 21:25:37,560 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 21:25:37,560 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 21:25:37,584 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 21:25:37,588 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 21:25:37,588 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 21:25:37,596 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 21:25:37,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 21:25:37,601 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:37,601 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:37,602 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:37,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:37,605 INFO L85 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 1 times [2022-04-06 21:25:37,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:37,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1774467306] [2022-04-06 21:25:37,616 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 21:25:37,616 INFO L85 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 2 times [2022-04-06 21:25:37,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:37,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294186360] [2022-04-06 21:25:37,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:37,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:37,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:25:37,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 21:25:37,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:25:37,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 21:25:37,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:25:37,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:25:37,744 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:37,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294186360] [2022-04-06 21:25:37,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294186360] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:37,745 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:37,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 21:25:37,747 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:37,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1774467306] [2022-04-06 21:25:37,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1774467306] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:37,747 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:37,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 21:25:37,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513844353] [2022-04-06 21:25:37,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:37,751 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 21:25:37,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:37,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 21:25:37,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 21:25:37,769 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:25:45,533 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 7.52s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-04-06 21:25:45,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:45,548 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2022-04-06 21:25:45,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 21:25:45,550 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-04-06 21:25:45,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:45,554 INFO L225 Difference]: With dead ends: 47 [2022-04-06 21:25:45,554 INFO L226 Difference]: Without dead ends: 23 [2022-04-06 21:25:45,556 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 21:25:45,558 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:45,559 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 30 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 7.8s Time] [2022-04-06 21:25:45,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-04-06 21:25:45,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-04-06 21:25:45,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 21:25:45,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-04-06 21:25:45,581 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2022-04-06 21:25:45,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:45,581 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-04-06 21:25:45,581 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:25:45,582 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-04-06 21:25:45,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 21:25:45,582 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:45,583 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:45,583 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 21:25:45,583 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:45,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:45,584 INFO L85 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 1 times [2022-04-06 21:25:45,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:45,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [901072244] [2022-04-06 21:25:45,584 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 21:25:45,585 INFO L85 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 2 times [2022-04-06 21:25:45,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:45,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275365716] [2022-04-06 21:25:45,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:45,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:45,597 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:45,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1285208356] [2022-04-06 21:25:45,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:45,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:45,597 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:45,599 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:45,610 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 21:25:45,645 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-04-06 21:25:45,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:45,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 21:25:45,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:45,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:25:45,744 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 21:25:45,745 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:45,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275365716] [2022-04-06 21:25:45,745 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:45,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285208356] [2022-04-06 21:25:45,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285208356] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:45,745 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:45,746 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:25:45,746 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:45,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [901072244] [2022-04-06 21:25:45,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [901072244] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:45,747 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:45,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:25:45,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120524271] [2022-04-06 21:25:45,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:45,747 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 21:25:45,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:45,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 21:25:45,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 21:25:45,748 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:25:45,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:45,799 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-04-06 21:25:45,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 21:25:45,800 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-04-06 21:25:45,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:45,801 INFO L225 Difference]: With dead ends: 34 [2022-04-06 21:25:45,801 INFO L226 Difference]: Without dead ends: 30 [2022-04-06 21:25:45,801 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 21:25:45,802 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:45,802 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 77 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 21:25:45,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-04-06 21:25:45,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-04-06 21:25:45,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 21:25:45,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-04-06 21:25:45,809 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2022-04-06 21:25:45,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:45,809 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-04-06 21:25:45,809 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:25:45,810 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-04-06 21:25:45,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-04-06 21:25:45,810 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:45,810 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:45,826 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-04-06 21:25:46,026 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:46,027 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:46,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:46,027 INFO L85 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 1 times [2022-04-06 21:25:46,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:46,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [979619921] [2022-04-06 21:25:46,041 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:46,041 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:46,041 INFO L85 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 2 times [2022-04-06 21:25:46,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:46,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597548318] [2022-04-06 21:25:46,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:46,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:46,052 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:46,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1508957997] [2022-04-06 21:25:46,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:46,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:46,053 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:46,058 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:46,059 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 21:25:46,092 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:25:46,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:46,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 21:25:46,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:46,172 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:25:46,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:46,313 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 21:25:46,313 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597548318] [2022-04-06 21:25:46,314 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508957997] [2022-04-06 21:25:46,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508957997] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:46,314 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:46,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-04-06 21:25:46,314 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [979619921] [2022-04-06 21:25:46,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [979619921] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:46,315 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:46,315 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:25:46,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025190381] [2022-04-06 21:25:46,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:46,315 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 21:25:46,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:46,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 21:25:46,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-04-06 21:25:46,316 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 21:25:46,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:46,350 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2022-04-06 21:25:46,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 21:25:46,351 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2022-04-06 21:25:46,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:46,351 INFO L225 Difference]: With dead ends: 36 [2022-04-06 21:25:46,351 INFO L226 Difference]: Without dead ends: 32 [2022-04-06 21:25:46,352 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 21:25:46,353 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:46,353 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 67 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 21:25:46,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-04-06 21:25:46,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-04-06 21:25:46,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 7 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 21:25:46,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-04-06 21:25:46,359 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 24 [2022-04-06 21:25:46,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:46,359 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-04-06 21:25:46,359 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 21:25:46,359 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-04-06 21:25:46,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-04-06 21:25:46,360 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:46,360 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:46,376 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:46,568 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-04-06 21:25:46,568 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:46,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:46,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1106328449, now seen corresponding path program 1 times [2022-04-06 21:25:46,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:46,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1168653421] [2022-04-06 21:25:46,573 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:46,573 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:46,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1106328449, now seen corresponding path program 2 times [2022-04-06 21:25:46,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:46,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517635560] [2022-04-06 21:25:46,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:46,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:46,581 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:46,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1074079593] [2022-04-06 21:25:46,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:46,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:46,581 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:46,583 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:46,584 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 21:25:46,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:25:46,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:46,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 21:25:46,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:46,776 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 21:25:46,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:46,923 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:46,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517635560] [2022-04-06 21:25:46,923 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:46,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074079593] [2022-04-06 21:25:46,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074079593] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:46,927 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:46,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2022-04-06 21:25:46,928 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:46,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1168653421] [2022-04-06 21:25:46,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1168653421] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:46,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:46,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 21:25:46,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160230934] [2022-04-06 21:25:46,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:46,928 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 21:25:46,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:46,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 21:25:46,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-04-06 21:25:46,929 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-04-06 21:25:46,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:46,988 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-04-06 21:25:46,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 21:25:46,988 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 35 [2022-04-06 21:25:46,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:46,989 INFO L225 Difference]: With dead ends: 41 [2022-04-06 21:25:46,989 INFO L226 Difference]: Without dead ends: 35 [2022-04-06 21:25:46,990 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-04-06 21:25:46,990 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:46,990 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 125 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 21:25:46,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-04-06 21:25:46,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-04-06 21:25:46,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 21:25:46,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-04-06 21:25:46,996 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 35 [2022-04-06 21:25:46,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:46,996 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-04-06 21:25:46,997 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-04-06 21:25:46,997 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-04-06 21:25:46,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-04-06 21:25:46,997 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:46,997 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:47,014 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:47,213 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:47,214 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:47,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:47,214 INFO L85 PathProgramCache]: Analyzing trace with hash 1564024736, now seen corresponding path program 3 times [2022-04-06 21:25:47,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:47,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1327722134] [2022-04-06 21:25:47,217 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:47,217 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:47,217 INFO L85 PathProgramCache]: Analyzing trace with hash 1564024736, now seen corresponding path program 4 times [2022-04-06 21:25:47,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:47,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944270931] [2022-04-06 21:25:47,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:47,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:47,225 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:47,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1929610084] [2022-04-06 21:25:47,225 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 21:25:47,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:47,225 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:47,239 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:47,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 21:25:47,269 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 21:25:47,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:47,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 16 conjunts are in the unsatisfiable core [2022-04-06 21:25:47,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:47,426 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 21:25:47,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:47,558 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:47,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944270931] [2022-04-06 21:25:47,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:47,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929610084] [2022-04-06 21:25:47,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929610084] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:47,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:47,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2022-04-06 21:25:47,562 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:47,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1327722134] [2022-04-06 21:25:47,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1327722134] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:47,562 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:47,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 21:25:47,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662380146] [2022-04-06 21:25:47,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:47,562 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 21:25:47,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:47,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 21:25:47,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-04-06 21:25:47,563 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-04-06 21:25:47,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:47,636 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-04-06 21:25:47,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 21:25:47,637 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 42 [2022-04-06 21:25:47,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:47,637 INFO L225 Difference]: With dead ends: 44 [2022-04-06 21:25:47,637 INFO L226 Difference]: Without dead ends: 38 [2022-04-06 21:25:47,638 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2022-04-06 21:25:47,638 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 2 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:47,639 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 154 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 21:25:47,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-04-06 21:25:47,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-04-06 21:25:47,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 9 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 21:25:47,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-04-06 21:25:47,646 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 42 [2022-04-06 21:25:47,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:47,646 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-04-06 21:25:47,646 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-04-06 21:25:47,646 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-04-06 21:25:47,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-04-06 21:25:47,647 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:47,647 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:47,669 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:47,863 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:47,863 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:47,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:47,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1951214241, now seen corresponding path program 5 times [2022-04-06 21:25:47,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:47,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [790733066] [2022-04-06 21:25:47,867 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:47,867 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:47,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1951214241, now seen corresponding path program 6 times [2022-04-06 21:25:47,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:47,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548791288] [2022-04-06 21:25:47,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:47,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:47,882 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:47,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1584625909] [2022-04-06 21:25:47,883 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 21:25:47,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:47,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:47,885 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:47,886 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 21:25:48,431 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 21:25:48,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:48,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 20 conjunts are in the unsatisfiable core [2022-04-06 21:25:48,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:48,586 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-06 21:25:48,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:48,723 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:48,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548791288] [2022-04-06 21:25:48,723 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:48,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584625909] [2022-04-06 21:25:48,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584625909] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:48,724 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:48,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-04-06 21:25:48,724 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:48,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [790733066] [2022-04-06 21:25:48,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [790733066] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:48,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:48,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 21:25:48,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864221491] [2022-04-06 21:25:48,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:48,725 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 21:25:48,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:48,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 21:25:48,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-04-06 21:25:48,725 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-04-06 21:25:48,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:48,805 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2022-04-06 21:25:48,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 21:25:48,806 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 49 [2022-04-06 21:25:48,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:48,807 INFO L225 Difference]: With dead ends: 47 [2022-04-06 21:25:48,807 INFO L226 Difference]: Without dead ends: 41 [2022-04-06 21:25:48,807 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2022-04-06 21:25:48,807 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 2 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:48,808 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 185 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 21:25:48,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-04-06 21:25:48,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-04-06 21:25:48,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 10 states have call successors, (10), 6 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-04-06 21:25:48,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-04-06 21:25:48,814 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 49 [2022-04-06 21:25:48,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:48,814 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-04-06 21:25:48,814 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-04-06 21:25:48,814 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-04-06 21:25:48,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-04-06 21:25:48,815 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:48,815 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:48,822 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:49,015 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:49,015 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:49,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:49,016 INFO L85 PathProgramCache]: Analyzing trace with hash 327675008, now seen corresponding path program 7 times [2022-04-06 21:25:49,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:49,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1708122731] [2022-04-06 21:25:49,019 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:49,019 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:49,019 INFO L85 PathProgramCache]: Analyzing trace with hash 327675008, now seen corresponding path program 8 times [2022-04-06 21:25:49,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:49,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892275253] [2022-04-06 21:25:49,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:49,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:49,026 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:49,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [947120687] [2022-04-06 21:25:49,026 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:49,026 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:49,026 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:49,027 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:49,028 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 21:25:49,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:25:49,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:49,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 24 conjunts are in the unsatisfiable core [2022-04-06 21:25:49,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:49,526 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-04-06 21:25:49,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:49,626 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:49,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892275253] [2022-04-06 21:25:49,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:49,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947120687] [2022-04-06 21:25:49,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947120687] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:49,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:49,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-04-06 21:25:49,626 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:49,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1708122731] [2022-04-06 21:25:49,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1708122731] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:49,627 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:49,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 21:25:49,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675772631] [2022-04-06 21:25:49,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:49,627 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 21:25:49,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:49,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 21:25:49,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-04-06 21:25:49,628 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-04-06 21:25:49,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:49,735 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2022-04-06 21:25:49,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 21:25:49,736 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 56 [2022-04-06 21:25:49,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:49,736 INFO L225 Difference]: With dead ends: 50 [2022-04-06 21:25:49,736 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 21:25:49,737 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-04-06 21:25:49,737 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 2 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:49,737 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 218 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 21:25:49,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 21:25:49,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-04-06 21:25:49,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 11 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-04-06 21:25:49,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2022-04-06 21:25:49,743 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 56 [2022-04-06 21:25:49,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:49,743 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2022-04-06 21:25:49,743 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-04-06 21:25:49,743 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2022-04-06 21:25:49,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-04-06 21:25:49,744 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:49,744 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:49,750 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:49,948 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:49,949 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:49,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:49,949 INFO L85 PathProgramCache]: Analyzing trace with hash -16244287, now seen corresponding path program 9 times [2022-04-06 21:25:49,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:49,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1435404242] [2022-04-06 21:25:49,951 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:49,951 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:49,951 INFO L85 PathProgramCache]: Analyzing trace with hash -16244287, now seen corresponding path program 10 times [2022-04-06 21:25:49,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:49,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789176412] [2022-04-06 21:25:49,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:49,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:49,958 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:49,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1541458940] [2022-04-06 21:25:49,958 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 21:25:49,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:49,958 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:49,959 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:49,960 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 21:25:50,008 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 21:25:50,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:50,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 28 conjunts are in the unsatisfiable core [2022-04-06 21:25:50,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:50,189 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 14 proven. 45 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-04-06 21:25:50,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:50,352 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:50,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789176412] [2022-04-06 21:25:50,352 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:50,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541458940] [2022-04-06 21:25:50,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541458940] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:50,352 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:50,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-04-06 21:25:50,353 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:50,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1435404242] [2022-04-06 21:25:50,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1435404242] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:50,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:50,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 21:25:50,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733674100] [2022-04-06 21:25:50,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:50,353 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 21:25:50,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:50,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 21:25:50,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-04-06 21:25:50,354 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2022-04-06 21:25:50,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:50,475 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2022-04-06 21:25:50,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 21:25:50,476 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 63 [2022-04-06 21:25:50,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:50,476 INFO L225 Difference]: With dead ends: 53 [2022-04-06 21:25:50,476 INFO L226 Difference]: Without dead ends: 47 [2022-04-06 21:25:50,477 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-04-06 21:25:50,477 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 2 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:50,477 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 253 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 21:25:50,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-04-06 21:25:50,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-04-06 21:25:50,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 12 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 21:25:50,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2022-04-06 21:25:50,484 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 63 [2022-04-06 21:25:50,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:50,484 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2022-04-06 21:25:50,484 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2022-04-06 21:25:50,484 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2022-04-06 21:25:50,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-04-06 21:25:50,485 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:50,485 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:50,510 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:50,700 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:50,701 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:50,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:50,701 INFO L85 PathProgramCache]: Analyzing trace with hash 570339680, now seen corresponding path program 11 times [2022-04-06 21:25:50,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:50,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1964942939] [2022-04-06 21:25:50,703 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:50,704 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:50,704 INFO L85 PathProgramCache]: Analyzing trace with hash 570339680, now seen corresponding path program 12 times [2022-04-06 21:25:50,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:50,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700014972] [2022-04-06 21:25:50,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:50,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:50,710 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:50,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1464456938] [2022-04-06 21:25:50,710 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 21:25:50,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:50,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:50,711 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:50,712 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 21:25:51,472 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 21:25:51,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:51,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-06 21:25:51,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:51,689 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 16 proven. 63 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 21:25:51,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:51,812 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:51,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700014972] [2022-04-06 21:25:51,812 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:51,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464456938] [2022-04-06 21:25:51,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464456938] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:51,812 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:51,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2022-04-06 21:25:51,813 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:51,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1964942939] [2022-04-06 21:25:51,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1964942939] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:51,813 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:51,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 21:25:51,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319812920] [2022-04-06 21:25:51,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:51,814 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 21:25:51,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:51,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 21:25:51,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-04-06 21:25:51,819 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-04-06 21:25:51,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:51,981 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2022-04-06 21:25:51,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 21:25:51,981 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 70 [2022-04-06 21:25:51,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:51,982 INFO L225 Difference]: With dead ends: 56 [2022-04-06 21:25:51,982 INFO L226 Difference]: Without dead ends: 50 [2022-04-06 21:25:51,982 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2022-04-06 21:25:51,983 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 2 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:51,983 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 290 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 21:25:51,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-06 21:25:51,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-04-06 21:25:51,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 13 states have call successors, (13), 6 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-04-06 21:25:51,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2022-04-06 21:25:51,989 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 70 [2022-04-06 21:25:51,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:51,989 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2022-04-06 21:25:51,989 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-04-06 21:25:51,989 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2022-04-06 21:25:51,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-04-06 21:25:51,990 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:51,990 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:52,001 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:52,196 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-04-06 21:25:52,196 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:52,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:52,196 INFO L85 PathProgramCache]: Analyzing trace with hash 724836577, now seen corresponding path program 13 times [2022-04-06 21:25:52,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:52,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1825603819] [2022-04-06 21:25:52,198 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:52,198 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:52,199 INFO L85 PathProgramCache]: Analyzing trace with hash 724836577, now seen corresponding path program 14 times [2022-04-06 21:25:52,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:52,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152300037] [2022-04-06 21:25:52,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:52,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:52,207 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:52,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1412789238] [2022-04-06 21:25:52,207 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:52,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:52,208 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:52,208 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:52,209 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 21:25:52,822 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:25:52,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:52,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 53 conjunts are in the unsatisfiable core [2022-04-06 21:25:52,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:53,159 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 63 proven. 93 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-04-06 21:25:53,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:26:11,831 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:26:11,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152300037] [2022-04-06 21:26:11,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:26:11,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412789238] [2022-04-06 21:26:11,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412789238] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:26:11,832 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:26:11,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-04-06 21:26:11,832 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:26:11,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1825603819] [2022-04-06 21:26:11,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1825603819] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:26:11,832 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:26:11,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 21:26:11,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686334229] [2022-04-06 21:26:11,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:26:11,832 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 21:26:11,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:26:11,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 21:26:11,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=464, Unknown=4, NotChecked=0, Total=552 [2022-04-06 21:26:11,833 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 18 states, 16 states have (on average 2.0) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2022-04-06 21:26:12,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:26:12,125 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2022-04-06 21:26:12,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-04-06 21:26:12,125 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.0) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 77 [2022-04-06 21:26:12,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:26:12,126 INFO L225 Difference]: With dead ends: 63 [2022-04-06 21:26:12,126 INFO L226 Difference]: Without dead ends: 57 [2022-04-06 21:26:12,126 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=105, Invalid=593, Unknown=4, NotChecked=0, Total=702 [2022-04-06 21:26:12,127 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 11 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 21:26:12,127 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 329 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 21:26:12,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-04-06 21:26:12,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-04-06 21:26:12,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 21:26:12,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2022-04-06 21:26:12,134 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 77 [2022-04-06 21:26:12,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:26:12,135 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2022-04-06 21:26:12,135 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.0) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2022-04-06 21:26:12,135 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2022-04-06 21:26:12,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-04-06 21:26:12,135 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:26:12,136 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:26:12,145 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-04-06 21:26:12,340 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-04-06 21:26:12,341 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:26:12,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:26:12,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1196125760, now seen corresponding path program 15 times [2022-04-06 21:26:12,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:26:12,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [253489083] [2022-04-06 21:26:12,356 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:26:12,356 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:26:12,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1196125760, now seen corresponding path program 16 times [2022-04-06 21:26:12,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:26:12,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814604745] [2022-04-06 21:26:12,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:26:12,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:26:12,363 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:26:12,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1023047138] [2022-04-06 21:26:12,363 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 21:26:12,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:26:12,363 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:26:12,364 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:26:12,366 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 21:26:12,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 21:26:12,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:26:12,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 40 conjunts are in the unsatisfiable core [2022-04-06 21:26:12,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:26:12,675 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 20 proven. 108 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-04-06 21:26:12,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:26:12,795 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:26:12,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814604745] [2022-04-06 21:26:12,796 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:26:12,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023047138] [2022-04-06 21:26:12,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023047138] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:26:12,796 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:26:12,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-04-06 21:26:12,796 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:26:12,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [253489083] [2022-04-06 21:26:12,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [253489083] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:26:12,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:26:12,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 21:26:12,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465671930] [2022-04-06 21:26:12,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:26:12,797 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 21:26:12,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:26:12,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 21:26:12,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-04-06 21:26:12,797 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2022-04-06 21:26:13,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:26:13,020 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2022-04-06 21:26:13,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 21:26:13,022 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 84 [2022-04-06 21:26:13,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:26:13,023 INFO L225 Difference]: With dead ends: 66 [2022-04-06 21:26:13,023 INFO L226 Difference]: Without dead ends: 60 [2022-04-06 21:26:13,023 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2022-04-06 21:26:13,023 INFO L913 BasicCegarLoop]: 49 mSDtfsCounter, 2 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 21:26:13,024 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 370 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 21:26:13,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-04-06 21:26:13,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-04-06 21:26:13,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 15 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-06 21:26:13,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2022-04-06 21:26:13,030 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 84 [2022-04-06 21:26:13,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:26:13,031 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2022-04-06 21:26:13,031 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2022-04-06 21:26:13,031 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2022-04-06 21:26:13,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-04-06 21:26:13,031 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:26:13,031 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:26:13,051 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 21:26:13,251 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-04-06 21:26:13,251 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:26:13,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:26:13,252 INFO L85 PathProgramCache]: Analyzing trace with hash -94164991, now seen corresponding path program 17 times [2022-04-06 21:26:13,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:26:13,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1377727322] [2022-04-06 21:26:13,254 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:26:13,254 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:26:13,254 INFO L85 PathProgramCache]: Analyzing trace with hash -94164991, now seen corresponding path program 18 times [2022-04-06 21:26:13,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:26:13,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617795705] [2022-04-06 21:26:13,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:26:13,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:26:13,260 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:26:13,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [638540956] [2022-04-06 21:26:13,260 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 21:26:13,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:26:13,260 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:26:13,261 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:26:13,262 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 21:26:13,833 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-04-06 21:26:13,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:26:13,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 55 conjunts are in the unsatisfiable core [2022-04-06 21:26:13,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:26:14,203 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 68 proven. 143 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2022-04-06 21:26:14,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:26:18,376 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse0 (* (- 18) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0)) (.cse1 (* (- 2) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0)) (.cse2 (* (- 119) c_main_~y~0 c_main_~y~0)) (.cse3 (* (- 65) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0))) (or (not (= (mod (+ .cse0 .cse1 .cse2 (* (- 120) c_main_~y~0 c_main_~y~0 c_main_~y~0) .cse3) 12) 0)) (forall ((main_~k~0 Int)) (or (< (+ c_main_~c~0 1) main_~k~0) (not (< c_main_~c~0 main_~k~0)) (let ((.cse4 (+ c_main_~y~0 1))) (= (* .cse4 .cse4) (* main_~k~0 .cse4))))) (not (<= (+ (* 10 (* c_main_~y~0 c_main_~y~0)) (* 5 (* c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0)) (* c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0) c_main_~x~0 1) (div (+ .cse0 .cse1 .cse2 (- 12) .cse3) (- 12)))))) is different from false [2022-04-06 21:26:22,427 WARN L833 $PredicateComparison]: unable to prove that (or (not (= (mod (+ (* (- 2) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0) (* (- 5) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0) (* (- 6) c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0 c_main_~y~0) (* c_main_~y~0 c_main_~y~0)) 12) 0)) (forall ((main_~k~0 Int)) (or (< (+ c_main_~c~0 1) main_~k~0) (not (< c_main_~c~0 main_~k~0)) (let ((.cse0 (+ c_main_~y~0 1))) (= (* .cse0 .cse0) (* main_~k~0 .cse0)))))) is different from false [2022-04-06 21:26:22,428 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:26:22,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617795705] [2022-04-06 21:26:22,429 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:26:22,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638540956] [2022-04-06 21:26:22,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638540956] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:26:22,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:26:22,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-04-06 21:26:22,429 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:26:22,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1377727322] [2022-04-06 21:26:22,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1377727322] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:26:22,429 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:26:22,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-04-06 21:26:22,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503878971] [2022-04-06 21:26:22,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:26:22,430 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-06 21:26:22,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:26:22,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-06 21:26:22,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=446, Unknown=2, NotChecked=86, Total=600 [2022-04-06 21:26:22,430 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2022-04-06 21:26:22,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:26:22,797 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2022-04-06 21:26:22,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-06 21:26:22,798 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) Word has length 91 [2022-04-06 21:26:22,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:26:22,800 INFO L225 Difference]: With dead ends: 69 [2022-04-06 21:26:22,800 INFO L226 Difference]: Without dead ends: 63 [2022-04-06 21:26:22,800 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=87, Invalid=569, Unknown=2, NotChecked=98, Total=756 [2022-04-06 21:26:22,800 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 21:26:22,801 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 393 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 21:26:22,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-04-06 21:26:22,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-04-06 21:26:22,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 16 states have call successors, (16), 7 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-04-06 21:26:22,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2022-04-06 21:26:22,817 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 91 [2022-04-06 21:26:22,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:26:22,819 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2022-04-06 21:26:22,819 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2022-04-06 21:26:22,819 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2022-04-06 21:26:22,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-04-06 21:26:22,820 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:26:22,820 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:26:22,829 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 21:26:23,026 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-04-06 21:26:23,026 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:26:23,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:26:23,026 INFO L85 PathProgramCache]: Analyzing trace with hash -107207904, now seen corresponding path program 19 times [2022-04-06 21:26:23,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:26:23,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [544103812] [2022-04-06 21:26:23,029 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:26:23,029 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:26:23,029 INFO L85 PathProgramCache]: Analyzing trace with hash -107207904, now seen corresponding path program 20 times [2022-04-06 21:26:23,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:26:23,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476335054] [2022-04-06 21:26:23,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:26:23,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:26:23,040 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:26:23,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2016495426] [2022-04-06 21:26:23,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:26:23,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:26:23,041 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:26:23,041 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:26:23,043 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 21:39:16,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:39:16,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:16,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 48 conjunts are in the unsatisfiable core [2022-04-06 21:39:16,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:16,666 INFO L134 CoverageAnalysis]: Checked inductivity of 453 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-04-06 21:39:16,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:16,820 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:16,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476335054] [2022-04-06 21:39:16,820 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:16,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016495426] [2022-04-06 21:39:16,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016495426] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:16,820 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:16,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2022-04-06 21:39:16,820 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:16,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [544103812] [2022-04-06 21:39:16,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [544103812] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:16,820 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:16,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-04-06 21:39:16,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683585532] [2022-04-06 21:39:16,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:16,822 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-04-06 21:39:16,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:16,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-04-06 21:39:16,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-04-06 21:39:16,822 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2022-04-06 21:39:17,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:17,110 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2022-04-06 21:39:17,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-04-06 21:39:17,111 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) Word has length 98 [2022-04-06 21:39:17,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:17,111 INFO L225 Difference]: With dead ends: 72 [2022-04-06 21:39:17,111 INFO L226 Difference]: Without dead ends: 66 [2022-04-06 21:39:17,112 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-04-06 21:39:17,117 INFO L913 BasicCegarLoop]: 55 mSDtfsCounter, 2 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 525 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 458 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:17,117 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 458 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 525 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 21:39:17,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-06 21:39:17,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2022-04-06 21:39:17,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 17 states have call successors, (17), 7 states have call predecessors, (17), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-04-06 21:39:17,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2022-04-06 21:39:17,126 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 98 [2022-04-06 21:39:17,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:17,127 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2022-04-06 21:39:17,127 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2022-04-06 21:39:17,127 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2022-04-06 21:39:17,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-04-06 21:39:17,127 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:17,127 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:17,237 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-04-06 21:39:17,331 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 21:39:17,331 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:17,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:17,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1185363745, now seen corresponding path program 21 times [2022-04-06 21:39:17,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:17,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1026094626] [2022-04-06 21:39:17,334 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:17,334 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:17,334 INFO L85 PathProgramCache]: Analyzing trace with hash 1185363745, now seen corresponding path program 22 times [2022-04-06 21:39:17,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:17,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472126963] [2022-04-06 21:39:17,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:17,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:17,340 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:17,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [331307492] [2022-04-06 21:39:17,340 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 21:39:17,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:17,340 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:17,341 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:17,342 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-06 21:39:17,382 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 21:39:17,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:17,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 52 conjunts are in the unsatisfiable core [2022-04-06 21:39:17,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:17,703 INFO L134 CoverageAnalysis]: Checked inductivity of 536 backedges. 26 proven. 198 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-04-06 21:39:17,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:17,891 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:17,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472126963] [2022-04-06 21:39:17,892 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:17,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331307492] [2022-04-06 21:39:17,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331307492] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:17,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:17,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-04-06 21:39:17,892 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:17,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1026094626] [2022-04-06 21:39:17,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1026094626] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:17,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:17,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-04-06 21:39:17,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411957382] [2022-04-06 21:39:17,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:17,893 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-04-06 21:39:17,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:17,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-04-06 21:39:17,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2022-04-06 21:39:17,894 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 14 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2022-04-06 21:39:18,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:18,226 INFO L93 Difference]: Finished difference Result 75 states and 87 transitions. [2022-04-06 21:39:18,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-06 21:39:18,226 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 14 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) Word has length 105 [2022-04-06 21:39:18,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:18,227 INFO L225 Difference]: With dead ends: 75 [2022-04-06 21:39:18,227 INFO L226 Difference]: Without dead ends: 69 [2022-04-06 21:39:18,227 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2022-04-06 21:39:18,227 INFO L913 BasicCegarLoop]: 58 mSDtfsCounter, 2 mSDsluCounter, 447 mSDsCounter, 0 mSdLazyCounter, 607 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:18,227 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 505 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 607 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 21:39:18,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-04-06 21:39:18,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-04-06 21:39:18,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 18 states have call successors, (18), 7 states have call predecessors, (18), 5 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-04-06 21:39:18,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2022-04-06 21:39:18,235 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 105 [2022-04-06 21:39:18,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:18,235 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2022-04-06 21:39:18,235 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 states have internal predecessors, (37), 14 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2022-04-06 21:39:18,235 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2022-04-06 21:39:18,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-04-06 21:39:18,236 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:18,236 INFO L499 BasicCegarLoop]: trace histogram [15, 14, 14, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:18,252 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-04-06 21:39:18,451 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 21:39:18,451 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:18,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:18,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1184813056, now seen corresponding path program 23 times [2022-04-06 21:39:18,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:18,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [218848805] [2022-04-06 21:39:18,453 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:18,453 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:18,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1184813056, now seen corresponding path program 24 times [2022-04-06 21:39:18,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:18,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261033298] [2022-04-06 21:39:18,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:18,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:18,459 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:18,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [405631088] [2022-04-06 21:39:18,460 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 21:39:18,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:18,460 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:18,460 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:18,482 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-04-06 21:39:22,504 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-04-06 21:39:22,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:22,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 56 conjunts are in the unsatisfiable core [2022-04-06 21:39:22,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:22,851 INFO L134 CoverageAnalysis]: Checked inductivity of 626 backedges. 28 proven. 234 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2022-04-06 21:39:22,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:23,000 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:23,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261033298] [2022-04-06 21:39:23,001 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:23,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405631088] [2022-04-06 21:39:23,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405631088] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:23,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:23,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-04-06 21:39:23,001 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:23,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [218848805] [2022-04-06 21:39:23,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [218848805] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:23,001 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:23,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 21:39:23,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026664929] [2022-04-06 21:39:23,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:23,002 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 21:39:23,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:23,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 21:39:23,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2022-04-06 21:39:23,002 INFO L87 Difference]: Start difference. First operand 69 states and 80 transitions. Second operand has 18 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 15 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2022-04-06 21:39:23,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:23,373 INFO L93 Difference]: Finished difference Result 78 states and 91 transitions. [2022-04-06 21:39:23,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-06 21:39:23,374 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 15 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) Word has length 112 [2022-04-06 21:39:23,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:23,374 INFO L225 Difference]: With dead ends: 78 [2022-04-06 21:39:23,374 INFO L226 Difference]: Without dead ends: 72 [2022-04-06 21:39:23,375 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-04-06 21:39:23,375 INFO L913 BasicCegarLoop]: 61 mSDtfsCounter, 2 mSDsluCounter, 493 mSDsCounter, 0 mSdLazyCounter, 695 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 695 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:23,375 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 554 Invalid, 696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 695 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 21:39:23,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-04-06 21:39:23,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2022-04-06 21:39:23,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 19 states have call successors, (19), 7 states have call predecessors, (19), 5 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-04-06 21:39:23,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 84 transitions. [2022-04-06 21:39:23,385 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 84 transitions. Word has length 112 [2022-04-06 21:39:23,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:23,385 INFO L478 AbstractCegarLoop]: Abstraction has 72 states and 84 transitions. [2022-04-06 21:39:23,385 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 15 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2022-04-06 21:39:23,385 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 84 transitions. [2022-04-06 21:39:23,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-04-06 21:39:23,386 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:23,386 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:23,395 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-04-06 21:39:23,586 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:23,587 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:23,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:23,587 INFO L85 PathProgramCache]: Analyzing trace with hash -493728191, now seen corresponding path program 25 times [2022-04-06 21:39:23,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:23,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [788720960] [2022-04-06 21:39:23,589 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:23,589 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:23,589 INFO L85 PathProgramCache]: Analyzing trace with hash -493728191, now seen corresponding path program 26 times [2022-04-06 21:39:23,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:23,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709281115] [2022-04-06 21:39:23,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:23,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:23,609 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:23,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [801223564] [2022-04-06 21:39:23,609 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:39:23,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:23,610 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:23,613 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:23,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-04-06 21:39:24,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:39:24,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:24,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 60 conjunts are in the unsatisfiable core [2022-04-06 21:39:24,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:25,212 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 30 proven. 273 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-04-06 21:39:25,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:25,344 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:25,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709281115] [2022-04-06 21:39:25,345 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:25,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801223564] [2022-04-06 21:39:25,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801223564] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:25,345 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:25,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-04-06 21:39:25,345 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:25,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [788720960] [2022-04-06 21:39:25,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [788720960] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:25,345 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:25,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-04-06 21:39:25,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484068922] [2022-04-06 21:39:25,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:25,346 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-06 21:39:25,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:25,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-06 21:39:25,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2022-04-06 21:39:25,346 INFO L87 Difference]: Start difference. First operand 72 states and 84 transitions. Second operand has 19 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 16 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2022-04-06 21:39:25,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:25,753 INFO L93 Difference]: Finished difference Result 81 states and 95 transitions. [2022-04-06 21:39:25,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-04-06 21:39:25,753 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 16 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) Word has length 119 [2022-04-06 21:39:25,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:25,754 INFO L225 Difference]: With dead ends: 81 [2022-04-06 21:39:25,754 INFO L226 Difference]: Without dead ends: 75 [2022-04-06 21:39:25,754 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2022-04-06 21:39:25,754 INFO L913 BasicCegarLoop]: 64 mSDtfsCounter, 2 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 605 SdHoareTripleChecker+Invalid, 790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:25,755 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 605 Invalid, 790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 21:39:25,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-04-06 21:39:25,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-04-06 21:39:25,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 20 states have call successors, (20), 7 states have call predecessors, (20), 5 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 21:39:25,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 88 transitions. [2022-04-06 21:39:25,763 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 88 transitions. Word has length 119 [2022-04-06 21:39:25,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:25,763 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 88 transitions. [2022-04-06 21:39:25,763 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 18 states have internal predecessors, (41), 16 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2022-04-06 21:39:25,763 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 88 transitions. [2022-04-06 21:39:25,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-04-06 21:39:25,764 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:25,764 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:25,774 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-04-06 21:39:25,964 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-04-06 21:39:25,965 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:25,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:25,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1283361568, now seen corresponding path program 27 times [2022-04-06 21:39:25,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:25,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1850064150] [2022-04-06 21:39:25,967 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:25,968 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:25,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1283361568, now seen corresponding path program 28 times [2022-04-06 21:39:25,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:25,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94375928] [2022-04-06 21:39:25,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:25,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:25,974 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:25,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [525352669] [2022-04-06 21:39:25,974 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 21:39:25,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:25,974 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:25,975 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:25,976 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-04-06 21:39:26,017 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 21:39:26,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:26,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 64 conjunts are in the unsatisfiable core [2022-04-06 21:39:26,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:26,387 INFO L134 CoverageAnalysis]: Checked inductivity of 827 backedges. 32 proven. 315 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2022-04-06 21:39:26,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:26,532 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:26,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94375928] [2022-04-06 21:39:26,532 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:26,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525352669] [2022-04-06 21:39:26,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525352669] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:26,532 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:26,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-04-06 21:39:26,532 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:26,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1850064150] [2022-04-06 21:39:26,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1850064150] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:26,532 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:26,533 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-04-06 21:39:26,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347247285] [2022-04-06 21:39:26,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:26,533 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-04-06 21:39:26,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:26,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-04-06 21:39:26,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2022-04-06 21:39:26,534 INFO L87 Difference]: Start difference. First operand 75 states and 88 transitions. Second operand has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 17 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2022-04-06 21:39:26,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:26,955 INFO L93 Difference]: Finished difference Result 84 states and 99 transitions. [2022-04-06 21:39:26,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-04-06 21:39:26,955 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 17 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) Word has length 126 [2022-04-06 21:39:26,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:26,956 INFO L225 Difference]: With dead ends: 84 [2022-04-06 21:39:26,956 INFO L226 Difference]: Without dead ends: 78 [2022-04-06 21:39:26,956 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2022-04-06 21:39:26,956 INFO L913 BasicCegarLoop]: 67 mSDtfsCounter, 2 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 889 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 658 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:26,956 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 658 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 889 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 21:39:26,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-04-06 21:39:26,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-04-06 21:39:26,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 21 states have call successors, (21), 7 states have call predecessors, (21), 5 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-04-06 21:39:26,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 92 transitions. [2022-04-06 21:39:26,965 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 92 transitions. Word has length 126 [2022-04-06 21:39:26,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:26,965 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 92 transitions. [2022-04-06 21:39:26,965 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 17 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 17 states have call predecessors, (18), 17 states have call successors, (18) [2022-04-06 21:39:26,965 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 92 transitions. [2022-04-06 21:39:26,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2022-04-06 21:39:26,966 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:26,966 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:26,982 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-04-06 21:39:27,171 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-04-06 21:39:27,171 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:27,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:27,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1187615391, now seen corresponding path program 29 times [2022-04-06 21:39:27,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:27,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1421138593] [2022-04-06 21:39:27,174 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:27,174 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:27,174 INFO L85 PathProgramCache]: Analyzing trace with hash -1187615391, now seen corresponding path program 30 times [2022-04-06 21:39:27,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:27,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068654946] [2022-04-06 21:39:27,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:27,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:27,180 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:27,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2110012716] [2022-04-06 21:39:27,180 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 21:39:27,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:27,180 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:27,181 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:27,182 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-04-06 21:39:30,469 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2022-04-06 21:39:30,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:30,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 68 conjunts are in the unsatisfiable core [2022-04-06 21:39:30,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:30,915 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 34 proven. 360 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-04-06 21:39:30,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:31,048 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:31,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068654946] [2022-04-06 21:39:31,048 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:31,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110012716] [2022-04-06 21:39:31,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110012716] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:31,048 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:31,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2022-04-06 21:39:31,048 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:31,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1421138593] [2022-04-06 21:39:31,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1421138593] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:31,049 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:31,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-04-06 21:39:31,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575686772] [2022-04-06 21:39:31,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:31,049 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-04-06 21:39:31,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:31,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-04-06 21:39:31,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2022-04-06 21:39:31,050 INFO L87 Difference]: Start difference. First operand 78 states and 92 transitions. Second operand has 21 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 18 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2022-04-06 21:39:31,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:31,511 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2022-04-06 21:39:31,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-04-06 21:39:31,512 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 18 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) Word has length 133 [2022-04-06 21:39:31,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:31,513 INFO L225 Difference]: With dead ends: 87 [2022-04-06 21:39:31,513 INFO L226 Difference]: Without dead ends: 81 [2022-04-06 21:39:31,513 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2022-04-06 21:39:31,513 INFO L913 BasicCegarLoop]: 70 mSDtfsCounter, 2 mSDsluCounter, 643 mSDsCounter, 0 mSdLazyCounter, 995 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 996 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 995 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:31,513 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 713 Invalid, 996 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 995 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 21:39:31,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-04-06 21:39:31,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-04-06 21:39:31,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 22 states have call successors, (22), 7 states have call predecessors, (22), 5 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-04-06 21:39:31,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 96 transitions. [2022-04-06 21:39:31,522 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 96 transitions. Word has length 133 [2022-04-06 21:39:31,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:31,523 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 96 transitions. [2022-04-06 21:39:31,523 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 18 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 18 states have call predecessors, (19), 18 states have call successors, (19) [2022-04-06 21:39:31,523 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 96 transitions. [2022-04-06 21:39:31,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-04-06 21:39:31,524 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:31,524 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:31,533 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-04-06 21:39:31,730 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-04-06 21:39:31,730 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:31,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:31,731 INFO L85 PathProgramCache]: Analyzing trace with hash 485626304, now seen corresponding path program 31 times [2022-04-06 21:39:31,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:31,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1381229979] [2022-04-06 21:39:31,733 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:31,733 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:31,733 INFO L85 PathProgramCache]: Analyzing trace with hash 485626304, now seen corresponding path program 32 times [2022-04-06 21:39:31,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:31,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227195310] [2022-04-06 21:39:31,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:31,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:31,739 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:31,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [737315790] [2022-04-06 21:39:31,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:39:31,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:31,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:31,740 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:31,741 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-04-06 21:39:41,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:39:41,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:41,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 72 conjunts are in the unsatisfiable core [2022-04-06 21:39:41,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:42,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 36 proven. 408 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2022-04-06 21:39:42,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:42,386 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:42,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227195310] [2022-04-06 21:39:42,386 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:42,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737315790] [2022-04-06 21:39:42,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737315790] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:42,386 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:42,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2022-04-06 21:39:42,386 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:42,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1381229979] [2022-04-06 21:39:42,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1381229979] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:42,386 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:42,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-04-06 21:39:42,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985535696] [2022-04-06 21:39:42,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:42,387 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-04-06 21:39:42,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:42,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-04-06 21:39:42,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2022-04-06 21:39:42,388 INFO L87 Difference]: Start difference. First operand 81 states and 96 transitions. Second operand has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 19 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2022-04-06 21:39:42,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:42,906 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2022-04-06 21:39:42,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-04-06 21:39:42,906 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 19 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 140 [2022-04-06 21:39:42,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:42,907 INFO L225 Difference]: With dead ends: 90 [2022-04-06 21:39:42,907 INFO L226 Difference]: Without dead ends: 84 [2022-04-06 21:39:42,907 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2022-04-06 21:39:42,908 INFO L913 BasicCegarLoop]: 73 mSDtfsCounter, 2 mSDsluCounter, 697 mSDsCounter, 0 mSdLazyCounter, 1107 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 770 SdHoareTripleChecker+Invalid, 1108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:42,908 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 770 Invalid, 1108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1107 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 21:39:42,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-04-06 21:39:42,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-04-06 21:39:42,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 55 states have (on average 1.018181818181818) internal successors, (56), 55 states have internal predecessors, (56), 23 states have call successors, (23), 7 states have call predecessors, (23), 5 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-04-06 21:39:42,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 100 transitions. [2022-04-06 21:39:42,922 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 100 transitions. Word has length 140 [2022-04-06 21:39:42,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:42,922 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 100 transitions. [2022-04-06 21:39:42,922 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 19 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2022-04-06 21:39:42,922 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 100 transitions. [2022-04-06 21:39:42,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-04-06 21:39:42,923 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:42,923 INFO L499 BasicCegarLoop]: trace histogram [20, 19, 19, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:42,947 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-04-06 21:39:43,131 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:43,131 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:43,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:43,132 INFO L85 PathProgramCache]: Analyzing trace with hash -299527039, now seen corresponding path program 33 times [2022-04-06 21:39:43,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:43,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [132589200] [2022-04-06 21:39:43,134 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:43,134 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:43,134 INFO L85 PathProgramCache]: Analyzing trace with hash -299527039, now seen corresponding path program 34 times [2022-04-06 21:39:43,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:43,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628423039] [2022-04-06 21:39:43,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:43,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:43,141 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:43,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1498954330] [2022-04-06 21:39:43,141 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 21:39:43,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:43,142 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:43,143 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:43,163 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-04-06 21:39:43,194 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 21:39:43,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:39:43,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 77 conjunts are in the unsatisfiable core [2022-04-06 21:39:43,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:39:43,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1181 backedges. 38 proven. 459 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2022-04-06 21:39:43,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:39:44,958 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:39:44,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628423039] [2022-04-06 21:39:44,958 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:39:44,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498954330] [2022-04-06 21:39:44,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498954330] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:39:44,958 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:39:44,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2022-04-06 21:39:44,959 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:39:44,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [132589200] [2022-04-06 21:39:44,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [132589200] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:39:44,959 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:39:44,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-04-06 21:39:44,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107372577] [2022-04-06 21:39:44,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:39:44,959 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-04-06 21:39:44,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:44,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-04-06 21:39:44,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=1345, Unknown=0, NotChecked=0, Total=1722 [2022-04-06 21:39:44,960 INFO L87 Difference]: Start difference. First operand 84 states and 100 transitions. Second operand has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 20 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2022-04-06 21:39:45,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:39:45,602 INFO L93 Difference]: Finished difference Result 93 states and 111 transitions. [2022-04-06 21:39:45,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-04-06 21:39:45,602 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 20 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) Word has length 147 [2022-04-06 21:39:45,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:39:45,603 INFO L225 Difference]: With dead ends: 93 [2022-04-06 21:39:45,603 INFO L226 Difference]: Without dead ends: 87 [2022-04-06 21:39:45,604 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 235 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=387, Invalid=1505, Unknown=0, NotChecked=0, Total=1892 [2022-04-06 21:39:45,604 INFO L913 BasicCegarLoop]: 76 mSDtfsCounter, 2 mSDsluCounter, 737 mSDsCounter, 0 mSdLazyCounter, 1241 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 813 SdHoareTripleChecker+Invalid, 1242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-06 21:39:45,604 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 813 Invalid, 1242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1241 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-06 21:39:45,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-04-06 21:39:45,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-04-06 21:39:45,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 57 states have (on average 1.0175438596491229) internal successors, (58), 57 states have internal predecessors, (58), 24 states have call successors, (24), 7 states have call predecessors, (24), 5 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-04-06 21:39:45,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 104 transitions. [2022-04-06 21:39:45,615 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 104 transitions. Word has length 147 [2022-04-06 21:39:45,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:39:45,616 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 104 transitions. [2022-04-06 21:39:45,616 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 20 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 20 states have call predecessors, (21), 20 states have call successors, (21) [2022-04-06 21:39:45,616 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 104 transitions. [2022-04-06 21:39:45,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-04-06 21:39:45,617 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:39:45,617 INFO L499 BasicCegarLoop]: trace histogram [21, 20, 20, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:39:45,643 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-04-06 21:39:45,843 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:45,843 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:39:45,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:39:45,844 INFO L85 PathProgramCache]: Analyzing trace with hash -1759598944, now seen corresponding path program 35 times [2022-04-06 21:39:45,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:39:45,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [311433220] [2022-04-06 21:39:45,846 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:39:45,846 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:39:45,846 INFO L85 PathProgramCache]: Analyzing trace with hash -1759598944, now seen corresponding path program 36 times [2022-04-06 21:39:45,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:39:45,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706288686] [2022-04-06 21:39:45,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:39:45,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:39:45,862 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:39:45,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [120538816] [2022-04-06 21:39:45,862 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 21:39:45,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:39:45,862 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:39:45,863 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:39:45,863 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process