/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/loops-crafted-1/mono-crafted_13.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 08:31:06,411 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 08:31:06,413 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 08:31:06,467 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-19 08:31:06,467 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-19 08:31:06,469 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-19 08:31:06,471 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-19 08:31:06,474 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-19 08:31:06,476 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-19 08:31:06,482 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-19 08:31:06,482 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-19 08:31:06,483 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-19 08:31:06,483 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-19 08:31:06,484 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-19 08:31:06,485 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-19 08:31:06,486 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-19 08:31:06,486 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-19 08:31:06,487 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-19 08:31:06,488 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-19 08:31:06,489 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-19 08:31:06,490 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-19 08:31:06,494 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-19 08:31:06,495 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-19 08:31:06,498 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-19 08:31:06,499 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-19 08:31:06,505 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-19 08:31:06,506 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-19 08:31:06,506 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-19 08:31:06,507 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-19 08:31:06,507 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-19 08:31:06,508 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-19 08:31:06,509 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-19 08:31:06,510 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-19 08:31:06,510 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-19 08:31:06,511 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-19 08:31:06,512 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-19 08:31:06,512 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-19 08:31:06,512 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-19 08:31:06,513 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-19 08:31:06,513 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 08:31:06,513 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 08:31:06,516 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 08:31:06,516 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 08:31:06,526 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 08:31:06,527 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 08:31:06,528 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 08:31:06,528 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 08:31:06,528 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 08:31:06,528 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 08:31:06,528 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 08:31:06,528 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 08:31:06,529 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 08:31:06,529 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 08:31:06,529 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 08:31:06,530 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 08:31:06,530 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 08:31:06,530 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 08:31:06,530 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 08:31:06,530 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:31:06,530 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 08:31:06,530 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 08:31:06,530 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 08:31:06,531 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 08:31:06,531 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 08:31:06,531 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 08:31:06,531 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 08:31:06,790 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 08:31:06,810 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 08:31:06,812 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 08:31:06,813 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 08:31:06,815 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 08:31:06,816 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c [2022-03-19 08:31:06,877 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7911b77e7/3c8cbcbe4a464e4c81c67417caae14cc/FLAG0a3825675 [2022-03-19 08:31:07,269 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 08:31:07,269 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c [2022-03-19 08:31:07,274 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7911b77e7/3c8cbcbe4a464e4c81c67417caae14cc/FLAG0a3825675 [2022-03-19 08:31:07,680 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7911b77e7/3c8cbcbe4a464e4c81c67417caae14cc [2022-03-19 08:31:07,682 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 08:31:07,683 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 08:31:07,688 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 08:31:07,688 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 08:31:07,692 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 08:31:07,692 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,693 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18e965b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07, skipping insertion in model container [2022-03-19 08:31:07,693 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,699 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 08:31:07,709 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 08:31:07,839 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c[319,332] [2022-03-19 08:31:07,858 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:31:07,865 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 08:31:07,876 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_13.c[319,332] [2022-03-19 08:31:07,883 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:31:07,894 INFO L208 MainTranslator]: Completed translation [2022-03-19 08:31:07,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07 WrapperNode [2022-03-19 08:31:07,895 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 08:31:07,896 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 08:31:07,896 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 08:31:07,896 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 08:31:07,905 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,905 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,912 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,912 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,926 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,930 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,932 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,939 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 08:31:07,939 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 08:31:07,940 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 08:31:07,940 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 08:31:07,941 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (1/1) ... [2022-03-19 08:31:07,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:31:07,967 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:07,985 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-19 08:31:08,007 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-19 08:31:08,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 08:31:08,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 08:31:08,024 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 08:31:08,024 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 08:31:08,024 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 08:31:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 08:31:08,026 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 08:31:08,026 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 08:31:08,027 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 08:31:08,027 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 08:31:08,085 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 08:31:08,087 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 08:31:08,242 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 08:31:08,247 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 08:31:08,247 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-19 08:31:08,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:31:08 BoogieIcfgContainer [2022-03-19 08:31:08,249 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 08:31:08,250 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 08:31:08,250 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 08:31:08,266 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 08:31:08,266 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 08:31:07" (1/3) ... [2022-03-19 08:31:08,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62fcd2e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:31:08, skipping insertion in model container [2022-03-19 08:31:08,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:31:07" (2/3) ... [2022-03-19 08:31:08,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62fcd2e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:31:08, skipping insertion in model container [2022-03-19 08:31:08,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:31:08" (3/3) ... [2022-03-19 08:31:08,268 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_13.c [2022-03-19 08:31:08,272 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 08:31:08,272 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 08:31:08,316 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 08:31:08,322 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-19 08:31:08,322 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 08:31:08,336 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 08:31:08,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-19 08:31:08,343 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:08,343 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:08,344 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:08,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:08,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1168619535, now seen corresponding path program 1 times [2022-03-19 08:31:08,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:08,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [605428104] [2022-03-19 08:31:08,366 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:31:08,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1168619535, now seen corresponding path program 2 times [2022-03-19 08:31:08,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:08,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557309122] [2022-03-19 08:31:08,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:08,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:08,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:08,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:08,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:08,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:08,530 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:08,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557309122] [2022-03-19 08:31:08,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557309122] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:08,531 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:08,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:31:08,533 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:08,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [605428104] [2022-03-19 08:31:08,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [605428104] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:08,535 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:08,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:31:08,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054897392] [2022-03-19 08:31:08,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:08,540 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 08:31:08,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:08,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 08:31:08,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 08:31:08,569 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:08,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:08,616 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-03-19 08:31:08,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 08:31:08,618 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-19 08:31:08,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:08,629 INFO L225 Difference]: With dead ends: 34 [2022-03-19 08:31:08,629 INFO L226 Difference]: Without dead ends: 14 [2022-03-19 08:31:08,632 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 08:31:08,636 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 14 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:08,638 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 25 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:31:08,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-03-19 08:31:08,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-03-19 08:31:08,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:08,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2022-03-19 08:31:08,678 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 12 [2022-03-19 08:31:08,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:08,678 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2022-03-19 08:31:08,678 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:08,679 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2022-03-19 08:31:08,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-19 08:31:08,679 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:08,679 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:08,680 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 08:31:08,680 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:08,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:08,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1458605129, now seen corresponding path program 1 times [2022-03-19 08:31:08,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:08,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1132783803] [2022-03-19 08:31:08,683 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:31:08,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1458605129, now seen corresponding path program 2 times [2022-03-19 08:31:08,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:08,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274752736] [2022-03-19 08:31:08,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:08,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:08,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:08,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:08,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:08,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:08,792 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:08,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274752736] [2022-03-19 08:31:08,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1274752736] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:08,793 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:08,793 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:31:08,793 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:08,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1132783803] [2022-03-19 08:31:08,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1132783803] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:08,794 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:08,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:31:08,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344868013] [2022-03-19 08:31:08,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:08,795 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 08:31:08,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:08,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 08:31:08,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 08:31:08,796 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:08,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:08,840 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2022-03-19 08:31:08,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 08:31:08,840 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-19 08:31:08,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:08,841 INFO L225 Difference]: With dead ends: 24 [2022-03-19 08:31:08,842 INFO L226 Difference]: Without dead ends: 16 [2022-03-19 08:31:08,842 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 08:31:08,844 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 12 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:08,845 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 21 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:31:08,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-19 08:31:08,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-03-19 08:31:08,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:08,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2022-03-19 08:31:08,863 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2022-03-19 08:31:08,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:08,864 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2022-03-19 08:31:08,864 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:08,864 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2022-03-19 08:31:08,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-19 08:31:08,865 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:08,865 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:08,865 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 08:31:08,865 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:08,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:08,866 INFO L85 PathProgramCache]: Analyzing trace with hash -1316432198, now seen corresponding path program 1 times [2022-03-19 08:31:08,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:08,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1083460259] [2022-03-19 08:31:08,983 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:31:08,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1148992352, now seen corresponding path program 1 times [2022-03-19 08:31:08,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:08,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40724812] [2022-03-19 08:31:08,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:08,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:09,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:09,027 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:09,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:09,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:09,040 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:09,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40724812] [2022-03-19 08:31:09,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40724812] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:09,041 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:09,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:31:09,095 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:09,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1083460259] [2022-03-19 08:31:09,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1083460259] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:09,095 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:09,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:31:09,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737020734] [2022-03-19 08:31:09,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:09,096 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:31:09,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:09,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:31:09,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-03-19 08:31:09,097 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:09,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:09,206 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-03-19 08:31:09,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:31:09,207 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-03-19 08:31:09,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:09,208 INFO L225 Difference]: With dead ends: 26 [2022-03-19 08:31:09,208 INFO L226 Difference]: Without dead ends: 20 [2022-03-19 08:31:09,208 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:31:09,209 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:09,210 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:31:09,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-19 08:31:09,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-19 08:31:09,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:09,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-03-19 08:31:09,215 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2022-03-19 08:31:09,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:09,215 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-03-19 08:31:09,215 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:09,216 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-03-19 08:31:09,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 08:31:09,216 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:09,216 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:09,216 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-19 08:31:09,216 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:09,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:09,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1342594849, now seen corresponding path program 1 times [2022-03-19 08:31:09,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:09,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [861754437] [2022-03-19 08:31:16,407 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:16,408 INFO L85 PathProgramCache]: Analyzing trace with hash -257826045, now seen corresponding path program 1 times [2022-03-19 08:31:16,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:16,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869320290] [2022-03-19 08:31:16,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:16,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:16,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:16,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:16,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:16,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:16,536 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:16,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869320290] [2022-03-19 08:31:16,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869320290] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:16,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821539350] [2022-03-19 08:31:16,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:16,536 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:16,537 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:16,543 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:31:16,555 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 08:31:16,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:16,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-19 08:31:16,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:16,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:16,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:17,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:17,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821539350] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:17,160 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:17,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 5] total 12 [2022-03-19 08:31:17,264 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:17,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [861754437] [2022-03-19 08:31:17,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [861754437] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:17,264 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:17,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:31:17,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275988821] [2022-03-19 08:31:17,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:17,265 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:31:17,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:17,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:31:17,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2022-03-19 08:31:17,266 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:17,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:17,402 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2022-03-19 08:31:17,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 08:31:17,403 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-19 08:31:17,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:17,405 INFO L225 Difference]: With dead ends: 37 [2022-03-19 08:31:17,405 INFO L226 Difference]: Without dead ends: 25 [2022-03-19 08:31:17,406 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=289, Unknown=0, NotChecked=0, Total=462 [2022-03-19 08:31:17,413 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:17,414 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 24 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:31:17,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-19 08:31:17,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-19 08:31:17,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:17,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-03-19 08:31:17,424 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2022-03-19 08:31:17,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:17,428 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-03-19 08:31:17,428 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:17,429 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-03-19 08:31:17,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-19 08:31:17,430 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:17,430 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:17,457 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:17,654 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:17,654 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:17,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:17,655 INFO L85 PathProgramCache]: Analyzing trace with hash 1246825262, now seen corresponding path program 2 times [2022-03-19 08:31:17,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:17,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1217062426] [2022-03-19 08:31:18,354 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:18,355 INFO L85 PathProgramCache]: Analyzing trace with hash 503576704, now seen corresponding path program 1 times [2022-03-19 08:31:18,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:18,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100066129] [2022-03-19 08:31:18,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:18,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:18,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:18,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:18,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:18,434 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:18,434 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:18,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100066129] [2022-03-19 08:31:18,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100066129] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:18,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991823473] [2022-03-19 08:31:18,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:18,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:18,435 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:18,436 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:31:18,447 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 08:31:18,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:18,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 08:31:18,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:18,625 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:18,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:20,741 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_main_~y~0_26 Int)) (let ((.cse0 (* 4 c_main_~y~0))) (or (not (= (mod (+ (* v_main_~y~0_26 4) .cse0) 8) 0)) (< (div (+ (* v_main_~y~0_26 (- 4)) .cse0) (- 8)) 0) (< (+ 2 c_main_~z~0) v_main_~y~0_26)))) is different from false [2022-03-19 08:31:20,780 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:20,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991823473] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:20,780 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:20,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 6] total 15 [2022-03-19 08:31:21,162 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:21,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1217062426] [2022-03-19 08:31:21,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1217062426] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:21,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:21,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 08:31:21,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367640546] [2022-03-19 08:31:21,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:21,163 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 08:31:21,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:21,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 08:31:21,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=258, Unknown=1, NotChecked=38, Total=462 [2022-03-19 08:31:21,163 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:21,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:21,235 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2022-03-19 08:31:21,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:31:21,239 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-19 08:31:21,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:21,241 INFO L225 Difference]: With dead ends: 43 [2022-03-19 08:31:21,241 INFO L226 Difference]: Without dead ends: 38 [2022-03-19 08:31:21,242 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=198, Invalid=357, Unknown=1, NotChecked=44, Total=600 [2022-03-19 08:31:21,242 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:21,243 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 33 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 18 Invalid, 0 Unknown, 32 Unchecked, 0.0s Time] [2022-03-19 08:31:21,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-19 08:31:21,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2022-03-19 08:31:21,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:21,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2022-03-19 08:31:21,254 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 24 [2022-03-19 08:31:21,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:21,254 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2022-03-19 08:31:21,254 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:21,254 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2022-03-19 08:31:21,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 08:31:21,255 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:21,255 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:21,282 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:21,471 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:21,472 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:21,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:21,472 INFO L85 PathProgramCache]: Analyzing trace with hash 32415221, now seen corresponding path program 3 times [2022-03-19 08:31:21,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:21,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [525911375] [2022-03-19 08:31:22,171 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:22,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1246422237, now seen corresponding path program 1 times [2022-03-19 08:31:22,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:22,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003301129] [2022-03-19 08:31:22,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:22,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:22,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:22,272 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:22,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:22,277 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:22,277 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:22,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003301129] [2022-03-19 08:31:22,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003301129] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:22,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899104421] [2022-03-19 08:31:22,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:22,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:22,278 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:22,279 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:31:22,306 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 08:31:22,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:22,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:31:22,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:22,722 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:22,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:22,914 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:22,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1899104421] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:22,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:22,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 19 [2022-03-19 08:31:23,057 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:23,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [525911375] [2022-03-19 08:31:23,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [525911375] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:23,057 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:23,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:31:23,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927778993] [2022-03-19 08:31:23,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:23,058 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:31:23,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:23,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:31:23,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=362, Unknown=0, NotChecked=0, Total=600 [2022-03-19 08:31:23,059 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:23,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:23,302 INFO L93 Difference]: Finished difference Result 70 states and 91 transitions. [2022-03-19 08:31:23,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 08:31:23,303 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-19 08:31:23,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:23,304 INFO L225 Difference]: With dead ends: 70 [2022-03-19 08:31:23,304 INFO L226 Difference]: Without dead ends: 42 [2022-03-19 08:31:23,305 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=466, Invalid=794, Unknown=0, NotChecked=0, Total=1260 [2022-03-19 08:31:23,305 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 30 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:23,306 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 24 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:31:23,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-19 08:31:23,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 32. [2022-03-19 08:31:23,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:23,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2022-03-19 08:31:23,314 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 25 [2022-03-19 08:31:23,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:23,315 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2022-03-19 08:31:23,315 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:23,315 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2022-03-19 08:31:23,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 08:31:23,316 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:23,316 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:23,333 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:23,523 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:23,524 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:23,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:23,524 INFO L85 PathProgramCache]: Analyzing trace with hash -712049397, now seen corresponding path program 4 times [2022-03-19 08:31:23,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:23,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [778119513] [2022-03-19 08:31:24,160 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:24,161 INFO L85 PathProgramCache]: Analyzing trace with hash -1714423037, now seen corresponding path program 1 times [2022-03-19 08:31:24,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:24,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671727366] [2022-03-19 08:31:24,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:24,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:24,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:24,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:24,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:24,265 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:24,265 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:24,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671727366] [2022-03-19 08:31:24,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671727366] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:24,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921138433] [2022-03-19 08:31:24,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:24,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:24,266 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:24,267 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:31:24,280 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 08:31:24,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:24,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:31:24,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:24,881 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:24,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:25,190 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:25,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921138433] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:25,191 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:25,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 25 [2022-03-19 08:31:25,362 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:25,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [778119513] [2022-03-19 08:31:25,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [778119513] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:25,362 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:25,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:31:25,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099559254] [2022-03-19 08:31:25,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:25,363 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:31:25,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:25,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:31:25,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=628, Unknown=0, NotChecked=0, Total=1056 [2022-03-19 08:31:25,364 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:25,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:25,721 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2022-03-19 08:31:25,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 08:31:25,721 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-19 08:31:25,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:25,722 INFO L225 Difference]: With dead ends: 62 [2022-03-19 08:31:25,722 INFO L226 Difference]: Without dead ends: 38 [2022-03-19 08:31:25,723 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=837, Invalid=1419, Unknown=0, NotChecked=0, Total=2256 [2022-03-19 08:31:25,724 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 47 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:25,724 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 24 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:31:25,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-19 08:31:25,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-19 08:31:25,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.121212121212121) internal successors, (37), 33 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:25,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-03-19 08:31:25,732 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 31 [2022-03-19 08:31:25,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:25,732 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-03-19 08:31:25,733 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:25,733 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-03-19 08:31:25,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:31:25,733 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:25,733 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:25,756 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:25,951 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:25,951 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:25,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:25,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1550884385, now seen corresponding path program 5 times [2022-03-19 08:31:25,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:25,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [903281764] [2022-03-19 08:31:26,425 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:26,426 INFO L85 PathProgramCache]: Analyzing trace with hash 1246188259, now seen corresponding path program 1 times [2022-03-19 08:31:26,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:26,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134118452] [2022-03-19 08:31:26,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:26,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:26,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:26,576 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:26,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:26,589 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:26,589 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:26,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134118452] [2022-03-19 08:31:26,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134118452] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:26,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925071035] [2022-03-19 08:31:26,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:26,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:26,590 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:26,592 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:31:26,623 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 08:31:26,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:26,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-19 08:31:26,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:27,318 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:27,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:27,681 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:27,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925071035] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:27,682 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:27,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 11] total 32 [2022-03-19 08:31:28,161 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:28,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [903281764] [2022-03-19 08:31:28,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [903281764] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:28,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:28,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-19 08:31:28,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848648243] [2022-03-19 08:31:28,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:28,162 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 08:31:28,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:28,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 08:31:28,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=731, Invalid=1075, Unknown=0, NotChecked=0, Total=1806 [2022-03-19 08:31:28,163 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 22 states, 22 states have (on average 1.5) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:28,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:28,319 INFO L93 Difference]: Finished difference Result 69 states and 76 transitions. [2022-03-19 08:31:28,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-19 08:31:28,319 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-19 08:31:28,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:28,320 INFO L225 Difference]: With dead ends: 69 [2022-03-19 08:31:28,320 INFO L226 Difference]: Without dead ends: 64 [2022-03-19 08:31:28,322 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 838 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=930, Invalid=1620, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:31:28,322 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:28,323 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 23 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2022-03-19 08:31:28,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-19 08:31:28,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2022-03-19 08:31:28,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:28,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2022-03-19 08:31:28,338 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 37 [2022-03-19 08:31:28,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:28,338 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2022-03-19 08:31:28,338 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5) internal successors, (33), 21 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:28,338 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2022-03-19 08:31:28,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-19 08:31:28,339 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:28,339 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:28,368 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:28,553 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:28,553 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:28,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:28,554 INFO L85 PathProgramCache]: Analyzing trace with hash 868313442, now seen corresponding path program 6 times [2022-03-19 08:31:28,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:28,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2143163336] [2022-03-19 08:31:29,150 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:29,152 INFO L85 PathProgramCache]: Analyzing trace with hash 2016654496, now seen corresponding path program 1 times [2022-03-19 08:31:29,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:29,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324301240] [2022-03-19 08:31:29,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:29,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:29,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:29,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:29,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:29,265 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:29,265 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:29,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324301240] [2022-03-19 08:31:29,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324301240] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:29,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099572291] [2022-03-19 08:31:29,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:29,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:29,265 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:29,266 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:31:29,267 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 08:31:29,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:29,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-19 08:31:29,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:29,638 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:29,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:30,080 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:30,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099572291] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:30,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:30,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 33 [2022-03-19 08:31:30,263 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:30,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2143163336] [2022-03-19 08:31:30,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2143163336] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:30,264 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:30,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-19 08:31:30,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527085429] [2022-03-19 08:31:30,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:30,264 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 08:31:30,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:30,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 08:31:30,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2022-03-19 08:31:30,265 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:30,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:30,682 INFO L93 Difference]: Finished difference Result 111 states and 131 transitions. [2022-03-19 08:31:30,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-19 08:31:30,683 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-03-19 08:31:30,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:30,684 INFO L225 Difference]: With dead ends: 111 [2022-03-19 08:31:30,684 INFO L226 Difference]: Without dead ends: 62 [2022-03-19 08:31:30,685 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 962 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1434, Invalid=2348, Unknown=0, NotChecked=0, Total=3782 [2022-03-19 08:31:30,686 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 43 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:30,686 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 34 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:31:30,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-19 08:31:30,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 44. [2022-03-19 08:31:30,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:30,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2022-03-19 08:31:30,699 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 38 [2022-03-19 08:31:30,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:30,699 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2022-03-19 08:31:30,699 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:30,699 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2022-03-19 08:31:30,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-19 08:31:30,700 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:30,700 INFO L500 BasicCegarLoop]: trace histogram [11, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:30,726 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:30,916 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:30,916 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:30,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:30,917 INFO L85 PathProgramCache]: Analyzing trace with hash -873897673, now seen corresponding path program 7 times [2022-03-19 08:31:30,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:30,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1368365797] [2022-03-19 08:31:31,430 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:31,430 INFO L85 PathProgramCache]: Analyzing trace with hash 121352963, now seen corresponding path program 1 times [2022-03-19 08:31:31,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:31,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431794783] [2022-03-19 08:31:31,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:31,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:31,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:31,589 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:31,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:31,595 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:31,595 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:31,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431794783] [2022-03-19 08:31:31,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431794783] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:31,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906120338] [2022-03-19 08:31:31,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:31,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:31,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:31,596 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) [2022-03-19 08:31:31,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 08:31:31,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:31,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-19 08:31:31,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:31,903 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:31,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:34,226 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_main_~y~0_155 Int)) (let ((.cse0 (* 2 c_main_~y~0))) (or (< (+ 9 c_main_~z~0) v_main_~y~0_155) (< (div (+ .cse0 (* (- 2) v_main_~y~0_155)) (- 4)) 0) (not (= (mod (+ .cse0 (* v_main_~y~0_155 2)) 4) 0))))) is different from false [2022-03-19 08:31:34,247 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:34,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [906120338] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:34,248 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:34,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 13] total 36 [2022-03-19 08:31:34,906 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:34,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1368365797] [2022-03-19 08:31:34,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1368365797] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:34,906 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:34,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:31:34,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025454475] [2022-03-19 08:31:34,906 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:34,907 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:31:34,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:34,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:31:34,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=935, Invalid=1324, Unknown=1, NotChecked=92, Total=2352 [2022-03-19 08:31:34,908 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 26 states, 26 states have (on average 1.5) internal successors, (39), 25 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:35,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:35,152 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2022-03-19 08:31:35,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:31:35,152 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5) internal successors, (39), 25 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-19 08:31:35,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:35,153 INFO L225 Difference]: With dead ends: 81 [2022-03-19 08:31:35,153 INFO L226 Difference]: Without dead ends: 76 [2022-03-19 08:31:35,154 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1213, Invalid=2096, Unknown=1, NotChecked=112, Total=3422 [2022-03-19 08:31:35,155 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:35,155 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 33 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 32 Invalid, 0 Unknown, 39 Unchecked, 0.0s Time] [2022-03-19 08:31:35,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-19 08:31:35,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 67. [2022-03-19 08:31:35,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.1290322580645162) internal successors, (70), 62 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:35,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 74 transitions. [2022-03-19 08:31:35,187 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 74 transitions. Word has length 43 [2022-03-19 08:31:35,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:35,189 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 74 transitions. [2022-03-19 08:31:35,189 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5) internal successors, (39), 25 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:35,190 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 74 transitions. [2022-03-19 08:31:35,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 08:31:35,192 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:35,192 INFO L500 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:35,208 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:35,392 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:35,393 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:35,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:35,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1285486324, now seen corresponding path program 8 times [2022-03-19 08:31:35,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:35,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [176943774] [2022-03-19 08:31:38,411 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:38,411 INFO L85 PathProgramCache]: Analyzing trace with hash 1188063360, now seen corresponding path program 1 times [2022-03-19 08:31:38,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:38,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832455302] [2022-03-19 08:31:38,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:38,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:38,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:38,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:38,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:38,564 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:38,564 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:38,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832455302] [2022-03-19 08:31:38,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832455302] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:38,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931322815] [2022-03-19 08:31:38,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:38,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:38,565 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:38,566 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) [2022-03-19 08:31:38,567 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 08:31:38,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:38,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:31:38,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:38,959 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:38,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:31:39,482 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:39,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931322815] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:31:39,483 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:31:39,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 14] total 39 [2022-03-19 08:31:39,687 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:31:39,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [176943774] [2022-03-19 08:31:39,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [176943774] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:31:39,687 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:31:39,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:31:39,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101786372] [2022-03-19 08:31:39,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:31:39,687 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:31:39,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:39,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:31:39,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1072, Invalid=1478, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:31:39,689 INFO L87 Difference]: Start difference. First operand 67 states and 74 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 25 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:40,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:31:40,284 INFO L93 Difference]: Finished difference Result 131 states and 151 transitions. [2022-03-19 08:31:40,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:31:40,284 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 25 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-19 08:31:40,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:31:40,285 INFO L225 Difference]: With dead ends: 131 [2022-03-19 08:31:40,285 INFO L226 Difference]: Without dead ends: 72 [2022-03-19 08:31:40,287 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1384 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2045, Invalid=3357, Unknown=0, NotChecked=0, Total=5402 [2022-03-19 08:31:40,287 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 75 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:31:40,287 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 34 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:31:40,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-19 08:31:40,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2022-03-19 08:31:40,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:40,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2022-03-19 08:31:40,304 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 44 [2022-03-19 08:31:40,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:31:40,304 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2022-03-19 08:31:40,304 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 25 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:31:40,304 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2022-03-19 08:31:40,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-19 08:31:40,305 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:31:40,305 INFO L500 BasicCegarLoop]: trace histogram [13, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:31:40,328 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 08:31:40,519 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,SelfDestructingSolverStorable10 [2022-03-19 08:31:40,520 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:31:40,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:31:40,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1125066317, now seen corresponding path program 9 times [2022-03-19 08:31:40,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:31:40,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [806762781] [2022-03-19 08:31:46,337 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:31:46,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1076729053, now seen corresponding path program 1 times [2022-03-19 08:31:46,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:31:46,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720277243] [2022-03-19 08:31:46,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:46,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:31:46,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:46,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:31:46,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:46,501 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:46,501 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:31:46,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720277243] [2022-03-19 08:31:46,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720277243] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:31:46,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773434784] [2022-03-19 08:31:46,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:31:46,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:31:46,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:31:46,503 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) [2022-03-19 08:31:46,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 08:31:46,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:31:46,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-19 08:31:46,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:31:47,789 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:31:47,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:32:05,162 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:05,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773434784] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:32:05,163 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:32:05,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 15] total 42 [2022-03-19 08:32:05,526 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:32:05,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [806762781] [2022-03-19 08:32:05,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [806762781] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:32:05,526 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:32:05,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 08:32:05,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275850192] [2022-03-19 08:32:05,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:32:05,526 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 08:32:05,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:05,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 08:32:05,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1293, Invalid=1787, Unknown=0, NotChecked=0, Total=3080 [2022-03-19 08:32:05,528 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 29 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 28 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:06,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:32:06,534 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2022-03-19 08:32:06,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-19 08:32:06,535 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 28 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2022-03-19 08:32:06,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:32:06,535 INFO L225 Difference]: With dead ends: 97 [2022-03-19 08:32:06,535 INFO L226 Difference]: Without dead ends: 55 [2022-03-19 08:32:06,537 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1744 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=2488, Invalid=4154, Unknown=0, NotChecked=0, Total=6642 [2022-03-19 08:32:06,538 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 55 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:32:06,538 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 29 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:32:06,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-19 08:32:06,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-19 08:32:06,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.08) internal successors, (54), 50 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:06,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-03-19 08:32:06,553 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 49 [2022-03-19 08:32:06,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:32:06,553 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-03-19 08:32:06,554 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 28 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:06,554 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-03-19 08:32:06,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-19 08:32:06,554 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:32:06,554 INFO L500 BasicCegarLoop]: trace histogram [15, 14, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:32:06,579 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-03-19 08:32:06,774 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:32:06,774 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:32:06,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:32:06,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1290979840, now seen corresponding path program 10 times [2022-03-19 08:32:06,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:06,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1378690716] [2022-03-19 08:32:07,559 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:32:07,560 INFO L85 PathProgramCache]: Analyzing trace with hash 1628554336, now seen corresponding path program 1 times [2022-03-19 08:32:07,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:32:07,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786929437] [2022-03-19 08:32:07,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:07,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:32:07,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:07,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:32:07,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:07,903 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:07,903 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:32:07,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786929437] [2022-03-19 08:32:07,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [786929437] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:32:07,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113645883] [2022-03-19 08:32:07,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:07,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:32:07,904 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:32:07,905 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) [2022-03-19 08:32:07,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 08:32:07,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:07,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:32:07,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:32:08,443 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:08,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:32:32,445 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:32,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113645883] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:32:32,446 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:32:32,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 15] total 44 [2022-03-19 08:32:33,984 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:32:33,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1378690716] [2022-03-19 08:32:33,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1378690716] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:32:33,985 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:32:33,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-19 08:32:33,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028164341] [2022-03-19 08:32:33,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:32:33,985 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-19 08:32:33,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:33,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-19 08:32:33,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1536, Invalid=2124, Unknown=0, NotChecked=0, Total=3660 [2022-03-19 08:32:33,986 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 33 states, 33 states have (on average 1.5151515151515151) internal successors, (50), 32 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:34,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:32:34,402 INFO L93 Difference]: Finished difference Result 103 states and 110 transitions. [2022-03-19 08:32:34,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-19 08:32:34,403 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.5151515151515151) internal successors, (50), 32 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2022-03-19 08:32:34,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:32:34,403 INFO L225 Difference]: With dead ends: 103 [2022-03-19 08:32:34,404 INFO L226 Difference]: Without dead ends: 98 [2022-03-19 08:32:34,405 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1881 ImplicationChecksByTransitivity, 26.1s TimeCoverageRelationStatistics Valid=2006, Invalid=3396, Unknown=0, NotChecked=0, Total=5402 [2022-03-19 08:32:34,406 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:32:34,406 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 38 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 37 Invalid, 0 Unknown, 62 Unchecked, 0.1s Time] [2022-03-19 08:32:34,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-19 08:32:34,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 86. [2022-03-19 08:32:34,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 81 states have (on average 1.0987654320987654) internal successors, (89), 81 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:34,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 93 transitions. [2022-03-19 08:32:34,436 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 93 transitions. Word has length 54 [2022-03-19 08:32:34,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:32:34,436 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 93 transitions. [2022-03-19 08:32:34,436 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.5151515151515151) internal successors, (50), 32 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:34,436 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 93 transitions. [2022-03-19 08:32:34,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-19 08:32:34,437 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:32:34,437 INFO L500 BasicCegarLoop]: trace histogram [15, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:32:34,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 08:32:34,651 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,SelfDestructingSolverStorable12 [2022-03-19 08:32:34,651 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:32:34,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:32:34,652 INFO L85 PathProgramCache]: Analyzing trace with hash -1330131613, now seen corresponding path program 11 times [2022-03-19 08:32:34,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:34,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [623208699] [2022-03-19 08:32:35,481 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:32:35,482 INFO L85 PathProgramCache]: Analyzing trace with hash 769489731, now seen corresponding path program 1 times [2022-03-19 08:32:35,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:32:35,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969222534] [2022-03-19 08:32:35,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:35,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:32:35,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:35,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:32:35,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:35,872 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:35,872 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:32:35,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969222534] [2022-03-19 08:32:35,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969222534] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:32:35,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538519084] [2022-03-19 08:32:35,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:35,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:32:35,873 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:32:35,876 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) [2022-03-19 08:32:35,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 08:32:35,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:35,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-19 08:32:35,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:32:36,385 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:36,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:32:37,438 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:37,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538519084] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:32:37,439 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:32:37,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 16] total 46 [2022-03-19 08:32:37,821 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:32:37,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [623208699] [2022-03-19 08:32:37,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [623208699] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:32:37,821 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:32:37,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-19 08:32:37,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601188092] [2022-03-19 08:32:37,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:32:37,821 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-19 08:32:37,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:37,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-19 08:32:37,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1622, Invalid=2160, Unknown=0, NotChecked=0, Total=3782 [2022-03-19 08:32:37,823 INFO L87 Difference]: Start difference. First operand 86 states and 93 transitions. Second operand has 34 states, 34 states have (on average 1.5) internal successors, (51), 33 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:39,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:32:39,105 INFO L93 Difference]: Finished difference Result 170 states and 191 transitions. [2022-03-19 08:32:39,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-19 08:32:39,107 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.5) internal successors, (51), 33 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-19 08:32:39,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:32:39,107 INFO L225 Difference]: With dead ends: 170 [2022-03-19 08:32:39,107 INFO L226 Difference]: Without dead ends: 92 [2022-03-19 08:32:39,109 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2292 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3229, Invalid=5327, Unknown=0, NotChecked=0, Total=8556 [2022-03-19 08:32:39,110 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 79 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:32:39,110 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 44 Invalid, 661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:32:39,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-03-19 08:32:39,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 62. [2022-03-19 08:32:39,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 57 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:39,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2022-03-19 08:32:39,129 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 55 [2022-03-19 08:32:39,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:32:39,130 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2022-03-19 08:32:39,130 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.5) internal successors, (51), 33 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:39,130 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2022-03-19 08:32:39,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-19 08:32:39,131 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:32:39,131 INFO L500 BasicCegarLoop]: trace histogram [17, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:32:39,151 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-19 08:32:39,341 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,SelfDestructingSolverStorable13 [2022-03-19 08:32:39,341 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:32:39,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:32:39,342 INFO L85 PathProgramCache]: Analyzing trace with hash -1183238535, now seen corresponding path program 12 times [2022-03-19 08:32:39,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:39,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1590904584] [2022-03-19 08:32:46,502 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:32:46,502 INFO L85 PathProgramCache]: Analyzing trace with hash -1770945757, now seen corresponding path program 1 times [2022-03-19 08:32:46,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:32:46,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896600170] [2022-03-19 08:32:46,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:46,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:32:46,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:46,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:32:46,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:46,832 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:46,832 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:32:46,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896600170] [2022-03-19 08:32:46,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896600170] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:32:46,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010838277] [2022-03-19 08:32:46,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:46,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:32:46,833 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:32:46,833 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) [2022-03-19 08:32:46,835 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 08:32:46,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:46,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-19 08:32:46,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:32:47,426 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:47,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:32:48,884 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:48,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010838277] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:32:48,885 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:32:48,885 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 18] total 52 [2022-03-19 08:32:49,363 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:32:49,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1590904584] [2022-03-19 08:32:49,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1590904584] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:32:49,363 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:32:49,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-19 08:32:49,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571374014] [2022-03-19 08:32:49,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:32:49,364 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-19 08:32:49,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:49,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-19 08:32:49,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2076, Invalid=2754, Unknown=0, NotChecked=0, Total=4830 [2022-03-19 08:32:49,365 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 38 states, 38 states have (on average 1.5) internal successors, (57), 37 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:50,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:32:50,960 INFO L93 Difference]: Finished difference Result 122 states and 134 transitions. [2022-03-19 08:32:50,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-19 08:32:50,961 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 37 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2022-03-19 08:32:50,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:32:50,961 INFO L225 Difference]: With dead ends: 122 [2022-03-19 08:32:50,961 INFO L226 Difference]: Without dead ends: 68 [2022-03-19 08:32:50,963 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2923 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4118, Invalid=6802, Unknown=0, NotChecked=0, Total=10920 [2022-03-19 08:32:50,964 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 87 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:32:50,964 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 39 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 672 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-19 08:32:50,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-19 08:32:50,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-03-19 08:32:50,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:50,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2022-03-19 08:32:50,987 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 61 [2022-03-19 08:32:50,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:32:50,987 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2022-03-19 08:32:50,987 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 37 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:32:50,987 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2022-03-19 08:32:50,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-19 08:32:50,988 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:32:50,988 INFO L500 BasicCegarLoop]: trace histogram [19, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:32:51,006 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-19 08:32:51,193 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,SelfDestructingSolverStorable14 [2022-03-19 08:32:51,194 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:32:51,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:32:51,194 INFO L85 PathProgramCache]: Analyzing trace with hash -1649852017, now seen corresponding path program 13 times [2022-03-19 08:32:51,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:32:51,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1221835340] [2022-03-19 08:32:52,222 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:32:52,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1874066685, now seen corresponding path program 1 times [2022-03-19 08:32:52,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:32:52,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221325944] [2022-03-19 08:32:52,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:52,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:32:52,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:52,597 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:32:52,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:52,600 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:52,601 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:32:52,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221325944] [2022-03-19 08:32:52,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221325944] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:32:52,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963879040] [2022-03-19 08:32:52,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:32:52,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:32:52,603 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:32:52,604 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) [2022-03-19 08:32:52,607 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 08:32:52,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:32:52,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-19 08:32:52,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:32:57,229 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:32:57,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:33:00,170 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:00,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963879040] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:33:00,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:33:00,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 21] total 61 [2022-03-19 08:33:00,805 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:33:00,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1221835340] [2022-03-19 08:33:00,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1221835340] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:33:00,805 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:33:00,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-19 08:33:00,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995597739] [2022-03-19 08:33:00,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:33:00,805 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-19 08:33:00,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:00,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-19 08:33:00,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2744, Invalid=3736, Unknown=0, NotChecked=0, Total=6480 [2022-03-19 08:33:00,807 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand has 42 states, 42 states have (on average 1.5) internal successors, (63), 41 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:02,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:33:02,830 INFO L93 Difference]: Finished difference Result 134 states and 146 transitions. [2022-03-19 08:33:02,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-19 08:33:02,830 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5) internal successors, (63), 41 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2022-03-19 08:33:02,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:33:02,831 INFO L225 Difference]: With dead ends: 134 [2022-03-19 08:33:02,831 INFO L226 Difference]: Without dead ends: 74 [2022-03-19 08:33:02,832 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3749 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=5331, Invalid=8949, Unknown=0, NotChecked=0, Total=14280 [2022-03-19 08:33:02,833 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 94 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 837 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 837 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:33:02,833 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 44 Invalid, 975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 837 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-19 08:33:02,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-19 08:33:02,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2022-03-19 08:33:02,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0579710144927537) internal successors, (73), 69 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:02,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2022-03-19 08:33:02,853 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 67 [2022-03-19 08:33:02,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:33:02,853 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2022-03-19 08:33:02,853 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.5) internal successors, (63), 41 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:02,853 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2022-03-19 08:33:02,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-03-19 08:33:02,853 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:33:02,853 INFO L500 BasicCegarLoop]: trace histogram [21, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:33:02,876 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-19 08:33:03,067 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,SelfDestructingSolverStorable15 [2022-03-19 08:33:03,067 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:33:03,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:33:03,068 INFO L85 PathProgramCache]: Analyzing trace with hash 526241445, now seen corresponding path program 14 times [2022-03-19 08:33:03,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:03,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [667239685] [2022-03-19 08:33:04,131 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:33:04,132 INFO L85 PathProgramCache]: Analyzing trace with hash -46990621, now seen corresponding path program 1 times [2022-03-19 08:33:04,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:33:04,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988428267] [2022-03-19 08:33:04,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:04,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:33:04,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:04,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:33:04,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:04,607 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:04,607 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:33:04,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988428267] [2022-03-19 08:33:04,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988428267] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:33:04,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260145279] [2022-03-19 08:33:04,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:04,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:33:04,608 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:33:04,609 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) [2022-03-19 08:33:04,611 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 08:33:04,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:04,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-19 08:33:04,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:33:10,323 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:10,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:33:22,501 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:22,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260145279] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:33:22,502 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:33:22,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 23] total 68 [2022-03-19 08:33:36,656 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:33:36,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [667239685] [2022-03-19 08:33:36,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [667239685] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:33:36,657 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:33:36,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-19 08:33:36,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432775092] [2022-03-19 08:33:36,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:33:36,657 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-19 08:33:36,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:36,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-19 08:33:36,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3424, Invalid=4766, Unknown=0, NotChecked=0, Total=8190 [2022-03-19 08:33:36,659 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand has 46 states, 46 states have (on average 1.5) internal successors, (69), 45 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:37,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:33:37,500 INFO L93 Difference]: Finished difference Result 141 states and 148 transitions. [2022-03-19 08:33:37,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-19 08:33:37,501 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5) internal successors, (69), 45 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2022-03-19 08:33:37,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:33:37,501 INFO L225 Difference]: With dead ends: 141 [2022-03-19 08:33:37,501 INFO L226 Difference]: Without dead ends: 136 [2022-03-19 08:33:37,503 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4081 ImplicationChecksByTransitivity, 31.5s TimeCoverageRelationStatistics Valid=4498, Invalid=7712, Unknown=0, NotChecked=0, Total=12210 [2022-03-19 08:33:37,503 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:33:37,503 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 33 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 27 Invalid, 0 Unknown, 52 Unchecked, 0.1s Time] [2022-03-19 08:33:37,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-03-19 08:33:37,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 117. [2022-03-19 08:33:37,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0714285714285714) internal successors, (120), 112 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:37,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 124 transitions. [2022-03-19 08:33:37,542 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 124 transitions. Word has length 73 [2022-03-19 08:33:37,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:33:37,542 INFO L478 AbstractCegarLoop]: Abstraction has 117 states and 124 transitions. [2022-03-19 08:33:37,543 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.5) internal successors, (69), 45 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:37,543 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 124 transitions. [2022-03-19 08:33:37,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-03-19 08:33:37,543 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:33:37,543 INFO L500 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:33:37,559 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 08:33:37,743 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:33:37,744 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:33:37,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:33:37,744 INFO L85 PathProgramCache]: Analyzing trace with hash -830846626, now seen corresponding path program 15 times [2022-03-19 08:33:37,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:37,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1391325186] [2022-03-19 08:33:47,347 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:33:47,348 INFO L85 PathProgramCache]: Analyzing trace with hash 564096160, now seen corresponding path program 1 times [2022-03-19 08:33:47,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:33:47,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137525745] [2022-03-19 08:33:47,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:47,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:33:47,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:47,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:33:47,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:47,776 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:47,776 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:33:47,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137525745] [2022-03-19 08:33:47,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137525745] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:33:47,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560518638] [2022-03-19 08:33:47,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:47,776 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:33:47,777 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:33:47,778 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) [2022-03-19 08:33:47,778 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 08:33:47,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:47,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:33:47,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:33:48,675 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:48,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:33:52,038 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:52,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560518638] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:33:52,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:33:52,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 66 [2022-03-19 08:33:52,608 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:33:52,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1391325186] [2022-03-19 08:33:52,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1391325186] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:33:52,608 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:33:52,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-19 08:33:52,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283210911] [2022-03-19 08:33:52,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:33:52,609 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-19 08:33:52,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:52,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-19 08:33:52,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3323, Invalid=4333, Unknown=0, NotChecked=0, Total=7656 [2022-03-19 08:33:52,610 INFO L87 Difference]: Start difference. First operand 117 states and 124 transitions. Second operand has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 45 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:54,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:33:54,715 INFO L93 Difference]: Finished difference Result 231 states and 251 transitions. [2022-03-19 08:33:54,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-19 08:33:54,715 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 45 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2022-03-19 08:33:54,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:33:54,716 INFO L225 Difference]: With dead ends: 231 [2022-03-19 08:33:54,716 INFO L226 Difference]: Without dead ends: 122 [2022-03-19 08:33:54,718 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4507 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=6477, Invalid=10553, Unknown=0, NotChecked=0, Total=17030 [2022-03-19 08:33:54,718 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 55 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 975 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 1076 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 975 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-19 08:33:54,718 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 39 Invalid, 1076 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 975 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-19 08:33:54,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-03-19 08:33:54,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 80. [2022-03-19 08:33:54,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:54,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2022-03-19 08:33:54,747 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 74 [2022-03-19 08:33:54,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:33:54,747 INFO L478 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2022-03-19 08:33:54,747 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 45 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:33:54,748 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2022-03-19 08:33:54,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-19 08:33:54,748 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:33:54,748 INFO L500 BasicCegarLoop]: trace histogram [23, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:33:54,767 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 08:33:54,959 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,SelfDestructingSolverStorable17 [2022-03-19 08:33:54,959 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:33:54,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:33:54,960 INFO L85 PathProgramCache]: Analyzing trace with hash 1751956923, now seen corresponding path program 16 times [2022-03-19 08:33:54,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:33:54,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1093712156] [2022-03-19 08:33:55,969 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:33:55,969 INFO L85 PathProgramCache]: Analyzing trace with hash 1756404483, now seen corresponding path program 1 times [2022-03-19 08:33:55,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:33:55,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142306861] [2022-03-19 08:33:55,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:55,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:33:55,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:56,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:33:56,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:56,487 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:56,487 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:33:56,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142306861] [2022-03-19 08:33:56,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142306861] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:33:56,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810132056] [2022-03-19 08:33:56,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:33:56,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:33:56,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:33:56,488 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) [2022-03-19 08:33:56,489 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 08:33:56,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:33:56,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-19 08:33:56,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:33:57,454 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:33:57,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:34:01,552 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:34:01,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810132056] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:34:01,552 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:34:01,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 24] total 71 [2022-03-19 08:34:03,039 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:34:03,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1093712156] [2022-03-19 08:34:03,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1093712156] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:34:03,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:34:03,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-19 08:34:03,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963712569] [2022-03-19 08:34:03,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:34:03,040 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-19 08:34:03,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:03,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-19 08:34:03,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3946, Invalid=5366, Unknown=0, NotChecked=0, Total=9312 [2022-03-19 08:34:03,041 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand has 51 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 50 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:04,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:34:04,916 INFO L93 Difference]: Finished difference Result 153 states and 160 transitions. [2022-03-19 08:34:04,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-19 08:34:04,917 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 50 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-03-19 08:34:04,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:34:04,918 INFO L225 Difference]: With dead ends: 153 [2022-03-19 08:34:04,918 INFO L226 Difference]: Without dead ends: 126 [2022-03-19 08:34:04,919 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 4087 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=5571, Invalid=8471, Unknown=0, NotChecked=0, Total=14042 [2022-03-19 08:34:04,919 INFO L912 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:34:04,920 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 44 Invalid, 726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 516 Invalid, 0 Unknown, 75 Unchecked, 0.6s Time] [2022-03-19 08:34:04,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-03-19 08:34:04,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2022-03-19 08:34:04,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 121 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:04,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 132 transitions. [2022-03-19 08:34:04,971 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 132 transitions. Word has length 79 [2022-03-19 08:34:04,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:34:04,972 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 132 transitions. [2022-03-19 08:34:04,972 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 50 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:04,972 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 132 transitions. [2022-03-19 08:34:04,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-19 08:34:04,972 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:34:04,973 INFO L500 BasicCegarLoop]: trace histogram [24, 23, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:34:04,998 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 08:34:05,189 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:34:05,190 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:34:05,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:34:05,190 INFO L85 PathProgramCache]: Analyzing trace with hash 197908886, now seen corresponding path program 17 times [2022-03-19 08:34:05,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:05,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1352289578] [2022-03-19 08:34:05,949 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:34:05,950 INFO L85 PathProgramCache]: Analyzing trace with hash -1124807869, now seen corresponding path program 1 times [2022-03-19 08:34:05,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:34:05,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134330210] [2022-03-19 08:34:05,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:34:05,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:34:05,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:06,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:34:06,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:06,483 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:34:06,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:34:06,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134330210] [2022-03-19 08:34:06,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134330210] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:34:06,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081905694] [2022-03-19 08:34:06,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:34:06,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:34:06,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:34:06,484 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) [2022-03-19 08:34:06,485 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 08:34:06,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:34:06,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-19 08:34:06,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:34:16,182 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:34:16,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:34:41,373 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:34:41,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081905694] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:34:41,373 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:34:41,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 25] total 73 [2022-03-19 08:34:42,256 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:34:42,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1352289578] [2022-03-19 08:34:42,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1352289578] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:34:42,257 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:34:42,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-19 08:34:42,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122547486] [2022-03-19 08:34:42,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:34:42,257 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-19 08:34:42,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:42,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-19 08:34:42,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4036, Invalid=5470, Unknown=0, NotChecked=0, Total=9506 [2022-03-19 08:34:42,259 INFO L87 Difference]: Start difference. First operand 126 states and 132 transitions. Second operand has 51 states, 51 states have (on average 1.5098039215686274) internal successors, (77), 50 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:45,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:34:45,447 INFO L93 Difference]: Finished difference Result 252 states and 272 transitions. [2022-03-19 08:34:45,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-19 08:34:45,448 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.5098039215686274) internal successors, (77), 50 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2022-03-19 08:34:45,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:34:45,448 INFO L225 Difference]: With dead ends: 252 [2022-03-19 08:34:45,448 INFO L226 Difference]: Without dead ends: 134 [2022-03-19 08:34:45,450 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5629 ImplicationChecksByTransitivity, 36.2s TimeCoverageRelationStatistics Valid=7863, Invalid=13307, Unknown=0, NotChecked=0, Total=21170 [2022-03-19 08:34:45,450 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 142 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 1470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:34:45,450 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 34 Invalid, 1470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-19 08:34:45,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-03-19 08:34:45,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 88. [2022-03-19 08:34:45,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0481927710843373) internal successors, (87), 83 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:45,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2022-03-19 08:34:45,473 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 81 [2022-03-19 08:34:45,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:34:45,474 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2022-03-19 08:34:45,474 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.5098039215686274) internal successors, (77), 50 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:34:45,474 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2022-03-19 08:34:45,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-19 08:34:45,474 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:34:45,474 INFO L500 BasicCegarLoop]: trace histogram [26, 25, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:34:45,495 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-19 08:34:45,687 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:34:45,687 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:34:45,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:34:45,687 INFO L85 PathProgramCache]: Analyzing trace with hash -641762708, now seen corresponding path program 18 times [2022-03-19 08:34:45,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:34:45,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1189094309]