/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-05ce600 [2022-02-23 15:46:40,078 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-23 15:46:40,080 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-23 15:46:40,117 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-02-23 15:46:40,134 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-02-23 15:46:40,136 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-02-23 15:46:40,137 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-02-23 15:46:40,139 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-02-23 15:46:40,140 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-02-23 15:46:40,140 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-02-23 15:46:40,142 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-02-23 15:46:40,146 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-02-23 15:46:40,147 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-02-23 15:46:40,148 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-02-23 15:46:40,149 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-02-23 15:46:40,149 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-02-23 15:46:40,154 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-02-23 15:46:40,160 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-23 15:46:40,160 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-23 15:46:40,161 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-23 15:46:40,161 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2022-02-23 15:46:40,169 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-23 15:46:40,170 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-23 15:46:40,171 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-23 15:46:40,171 INFO L138 SettingsManager]: * sizeof long=4 [2022-02-23 15:46:40,171 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-23 15:46:40,171 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-02-23 15:46:40,171 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-23 15:46:40,171 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-23 15:46:40,172 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-23 15:46:40,172 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-23 15:46:40,172 INFO L138 SettingsManager]: * sizeof long double=12 [2022-02-23 15:46:40,172 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-23 15:46:40,172 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-23 15:46:40,172 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-23 15:46:40,173 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-23 15:46:40,173 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-23 15:46:40,173 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-23 15:46:40,173 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-23 15:46:40,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-23 15:46:40,173 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-23 15:46:40,173 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-02-23 15:46:40,174 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-02-23 15:46:40,174 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-23 15:46:40,342 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-23 15:46:40,361 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-23 15:46:40,362 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-23 15:46:40,363 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-23 15:46:40,363 INFO L275 PluginConnector]: CDTParser initialized [2022-02-23 15:46:40,364 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2022-02-23 15:46:40,426 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b49fb7c8/8e34f1175a61466b94f94d3502b82763/FLAGfe43d8ecd [2022-02-23 15:46:40,779 INFO L306 CDTParser]: Found 1 translation units. [2022-02-23 15:46:40,779 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2022-02-23 15:46:40,783 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b49fb7c8/8e34f1175a61466b94f94d3502b82763/FLAGfe43d8ecd [2022-02-23 15:46:40,801 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b49fb7c8/8e34f1175a61466b94f94d3502b82763 [2022-02-23 15:46:40,803 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-23 15:46:40,804 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-02-23 15:46:40,808 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-23 15:46:40,808 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-23 15:46:40,810 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-23 15:46:40,811 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,812 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6705612e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40, skipping insertion in model container [2022-02-23 15:46:40,812 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,816 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-23 15:46:40,825 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-23 15:46:40,941 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/invert_string-1.c[352,365] [2022-02-23 15:46:40,953 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-23 15:46:40,957 INFO L203 MainTranslator]: Completed pre-run [2022-02-23 15:46:40,964 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/invert_string-1.c[352,365] [2022-02-23 15:46:40,968 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-23 15:46:40,977 INFO L208 MainTranslator]: Completed translation [2022-02-23 15:46:40,977 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40 WrapperNode [2022-02-23 15:46:40,977 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-23 15:46:40,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-23 15:46:40,978 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-23 15:46:40,978 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-23 15:46:40,985 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,985 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,990 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,990 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,994 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,996 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,997 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:40,998 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-23 15:46:40,999 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-23 15:46:40,999 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-23 15:46:40,999 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-23 15:46:41,000 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (1/1) ... [2022-02-23 15:46:41,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-23 15:46:41,011 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 15:46:41,021 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-02-23 15:46:41,032 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-02-23 15:46:41,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-23 15:46:41,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-23 15:46:41,056 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-23 15:46:41,056 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-23 15:46:41,056 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-23 15:46:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-23 15:46:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-23 15:46:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-23 15:46:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-23 15:46:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-23 15:46:41,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-23 15:46:41,103 INFO L234 CfgBuilder]: Building ICFG [2022-02-23 15:46:41,104 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-23 15:46:41,197 INFO L275 CfgBuilder]: Performing block encoding [2022-02-23 15:46:41,200 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-23 15:46:41,200 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-02-23 15:46:41,202 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 03:46:41 BoogieIcfgContainer [2022-02-23 15:46:41,202 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-23 15:46:41,202 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-02-23 15:46:41,202 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-02-23 15:46:41,207 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-02-23 15:46:41,212 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 03:46:41" (1/1) ... [2022-02-23 15:46:41,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 23.02 03:46:41 BasicIcfg [2022-02-23 15:46:41,223 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-02-23 15:46:41,224 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-23 15:46:41,224 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-23 15:46:41,226 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-23 15:46:41,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 03:46:40" (1/4) ... [2022-02-23 15:46:41,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21145832 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 03:46:41, skipping insertion in model container [2022-02-23 15:46:41,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 03:46:40" (2/4) ... [2022-02-23 15:46:41,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21145832 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 03:46:41, skipping insertion in model container [2022-02-23 15:46:41,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 03:46:41" (3/4) ... [2022-02-23 15:46:41,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21145832 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 03:46:41, skipping insertion in model container [2022-02-23 15:46:41,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 23.02 03:46:41" (4/4) ... [2022-02-23 15:46:41,228 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.cJordan [2022-02-23 15:46:41,231 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2022-02-23 15:46:41,231 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-23 15:46:41,273 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-23 15:46:41,288 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=ForwardPredicates, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, 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, mLoopAccelerationTechnique=FAST_UPR [2022-02-23 15:46:41,288 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-23 15:46:41,298 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-23 15:46:41,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-02-23 15:46:41,316 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:41,316 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:41,316 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:41,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:41,320 INFO L85 PathProgramCache]: Analyzing trace with hash 1459888189, now seen corresponding path program 1 times [2022-02-23 15:46:41,330 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:41,330 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374880092] [2022-02-23 15:46:41,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:41,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:41,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:41,495 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:41,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:41,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:41,517 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:41,518 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374880092] [2022-02-23 15:46:41,518 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374880092] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-23 15:46:41,518 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-23 15:46:41,518 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-02-23 15:46:41,519 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48507846] [2022-02-23 15:46:41,520 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-23 15:46:41,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-02-23 15:46:41,523 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:41,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-02-23 15:46:41,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-23 15:46:41,555 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 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 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:41,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:41,598 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-02-23 15:46:41,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-02-23 15:46:41,603 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-02-23 15:46:41,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:41,607 INFO L225 Difference]: With dead ends: 29 [2022-02-23 15:46:41,607 INFO L226 Difference]: Without dead ends: 24 [2022-02-23 15:46:41,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-23 15:46:41,611 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:41,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 33 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-23 15:46:41,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-02-23 15:46:41,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-02-23 15:46:41,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-23 15:46:41,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-02-23 15:46:41,638 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2022-02-23 15:46:41,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:41,639 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-02-23 15:46:41,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:41,640 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-02-23 15:46:41,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-02-23 15:46:41,640 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:41,641 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:41,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-23 15:46:41,641 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:41,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:41,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1257013952, now seen corresponding path program 1 times [2022-02-23 15:46:41,644 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:41,645 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386625168] [2022-02-23 15:46:41,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:41,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:41,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:41,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:41,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:41,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:41,757 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:41,758 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386625168] [2022-02-23 15:46:41,758 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386625168] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-23 15:46:41,758 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-23 15:46:41,758 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-02-23 15:46:41,758 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703238019] [2022-02-23 15:46:41,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-23 15:46:41,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-02-23 15:46:41,760 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:41,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-02-23 15:46:41,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-02-23 15:46:41,763 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:41,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:41,847 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2022-02-23 15:46:41,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-02-23 15:46:41,848 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-02-23 15:46:41,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:41,851 INFO L225 Difference]: With dead ends: 30 [2022-02-23 15:46:41,851 INFO L226 Difference]: Without dead ends: 30 [2022-02-23 15:46:41,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-02-23 15:46:41,856 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 40 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:41,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 24 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-23 15:46:41,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-02-23 15:46:41,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2022-02-23 15:46:41,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-23 15:46:41,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-02-23 15:46:41,867 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-02-23 15:46:41,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:41,868 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-02-23 15:46:41,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:41,869 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-02-23 15:46:41,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-02-23 15:46:41,872 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:41,872 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:41,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-23 15:46:41,877 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:41,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:41,877 INFO L85 PathProgramCache]: Analyzing trace with hash 313528638, now seen corresponding path program 1 times [2022-02-23 15:46:41,878 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:41,878 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4288370] [2022-02-23 15:46:41,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:41,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:41,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:41,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:41,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:41,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-02-23 15:46:41,948 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:41,948 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4288370] [2022-02-23 15:46:41,949 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4288370] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-23 15:46:41,949 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-23 15:46:41,949 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-02-23 15:46:41,950 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511398900] [2022-02-23 15:46:41,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-23 15:46:41,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-02-23 15:46:41,950 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:41,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-02-23 15:46:41,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-02-23 15:46:41,951 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:42,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:42,024 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-02-23 15:46:42,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-02-23 15:46:42,025 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (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 [2022-02-23 15:46:42,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:42,025 INFO L225 Difference]: With dead ends: 26 [2022-02-23 15:46:42,025 INFO L226 Difference]: Without dead ends: 26 [2022-02-23 15:46:42,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-02-23 15:46:42,031 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:42,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 27 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-23 15:46:42,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-02-23 15:46:42,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-02-23 15:46:42,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-23 15:46:42,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-02-23 15:46:42,036 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2022-02-23 15:46:42,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:42,036 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-02-23 15:46:42,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:42,036 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-02-23 15:46:42,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-02-23 15:46:42,037 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:42,037 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:42,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-23 15:46:42,037 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:42,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:42,038 INFO L85 PathProgramCache]: Analyzing trace with hash -617930468, now seen corresponding path program 1 times [2022-02-23 15:46:42,038 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:42,038 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791798928] [2022-02-23 15:46:42,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:42,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:42,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:42,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:42,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:42,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:42,287 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:42,287 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791798928] [2022-02-23 15:46:42,287 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791798928] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 15:46:42,287 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750076619] [2022-02-23 15:46:42,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:42,287 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:42,287 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 15:46:42,289 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-23 15:46:42,295 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-02-23 15:46:42,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:42,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 31 conjunts are in the unsatisfiable core [2022-02-23 15:46:42,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 15:46:42,399 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-02-23 15:46:42,506 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2022-02-23 15:46:42,596 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-02-23 15:46:42,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:42,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 15:46:42,687 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-02-23 15:46:42,689 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-02-23 15:46:42,702 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-02-23 15:46:42,715 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-02-23 15:46:42,715 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-02-23 15:46:42,898 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:42,899 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1750076619] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 15:46:42,899 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 15:46:42,899 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2022-02-23 15:46:42,899 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851704047] [2022-02-23 15:46:42,899 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 15:46:42,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-23 15:46:42,899 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:42,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-23 15:46:42,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-02-23 15:46:42,900 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:43,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:43,370 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2022-02-23 15:46:43,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-23 15:46:43,370 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-02-23 15:46:43,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:43,371 INFO L225 Difference]: With dead ends: 52 [2022-02-23 15:46:43,371 INFO L226 Difference]: Without dead ends: 52 [2022-02-23 15:46:43,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=287, Invalid=1119, Unknown=0, NotChecked=0, Total=1406 [2022-02-23 15:46:43,372 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 82 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:43,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 56 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-23 15:46:43,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-02-23 15:46:43,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 39. [2022-02-23 15:46:43,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-23 15:46:43,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2022-02-23 15:46:43,377 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2022-02-23 15:46:43,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:43,377 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2022-02-23 15:46:43,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:43,377 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2022-02-23 15:46:43,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-02-23 15:46:43,377 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:43,378 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:43,418 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-02-23 15:46:43,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:43,595 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:43,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:43,595 INFO L85 PathProgramCache]: Analyzing trace with hash 809600538, now seen corresponding path program 2 times [2022-02-23 15:46:43,595 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:43,596 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004147428] [2022-02-23 15:46:43,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:43,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:43,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:43,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:43,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:43,659 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:43,659 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:43,659 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004147428] [2022-02-23 15:46:43,660 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004147428] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 15:46:43,660 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722711610] [2022-02-23 15:46:43,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-02-23 15:46:43,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:43,660 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 15:46:43,662 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-23 15:46:43,663 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-02-23 15:46:43,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-02-23 15:46:43,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 15:46:43,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2022-02-23 15:46:43,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 15:46:43,738 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:43,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 15:46:43,776 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:43,777 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722711610] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 15:46:43,777 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 15:46:43,777 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 7 [2022-02-23 15:46:43,777 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253452722] [2022-02-23 15:46:43,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 15:46:43,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-02-23 15:46:43,778 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:43,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-02-23 15:46:43,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-02-23 15:46:43,778 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:43,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:43,887 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2022-02-23 15:46:43,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-02-23 15:46:43,888 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-02-23 15:46:43,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:43,889 INFO L225 Difference]: With dead ends: 48 [2022-02-23 15:46:43,889 INFO L226 Difference]: Without dead ends: 48 [2022-02-23 15:46:43,889 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2022-02-23 15:46:43,889 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:43,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 36 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-23 15:46:43,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-02-23 15:46:43,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-02-23 15:46:43,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 34 states have internal predecessors, (38), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-23 15:46:43,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-02-23 15:46:43,893 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2022-02-23 15:46:43,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:43,893 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-02-23 15:46:43,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:43,894 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-02-23 15:46:43,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-02-23 15:46:43,894 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:43,894 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:43,921 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-02-23 15:46:44,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:44,108 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:44,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:44,108 INFO L85 PathProgramCache]: Analyzing trace with hash -634204424, now seen corresponding path program 3 times [2022-02-23 15:46:44,108 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:44,108 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280131497] [2022-02-23 15:46:44,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:44,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:44,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:44,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:44,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:44,353 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:44,354 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:44,354 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280131497] [2022-02-23 15:46:44,354 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280131497] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 15:46:44,354 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873431059] [2022-02-23 15:46:44,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-02-23 15:46:44,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:44,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 15:46:44,355 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-23 15:46:44,375 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-02-23 15:46:44,402 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-02-23 15:46:44,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 15:46:44,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 33 conjunts are in the unsatisfiable core [2022-02-23 15:46:44,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 15:46:44,424 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-02-23 15:46:44,541 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-02-23 15:46:44,579 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-02-23 15:46:44,670 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-02-23 15:46:44,670 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-02-23 15:46:44,697 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:44,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 15:46:46,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 108 [2022-02-23 15:46:46,063 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-02-23 15:46:46,064 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 201 treesize of output 179 [2022-02-23 15:46:46,305 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:46,305 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873431059] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 15:46:46,305 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 15:46:46,305 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 35 [2022-02-23 15:46:46,305 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844364274] [2022-02-23 15:46:46,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 15:46:46,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-23 15:46:46,306 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:46,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-23 15:46:46,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1047, Unknown=2, NotChecked=0, Total=1190 [2022-02-23 15:46:46,307 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:47,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:47,321 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2022-02-23 15:46:47,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-23 15:46:47,322 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-02-23 15:46:47,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:47,323 INFO L225 Difference]: With dead ends: 78 [2022-02-23 15:46:47,323 INFO L226 Difference]: Without dead ends: 78 [2022-02-23 15:46:47,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=560, Invalid=3098, Unknown=2, NotChecked=0, Total=3660 [2022-02-23 15:46:47,325 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 76 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 978 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 1167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:47,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 122 Invalid, 1167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 978 Invalid, 0 Unknown, 48 Unchecked, 0.4s Time] [2022-02-23 15:46:47,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-02-23 15:46:47,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 46. [2022-02-23 15:46:47,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-23 15:46:47,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-02-23 15:46:47,329 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2022-02-23 15:46:47,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:47,329 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-02-23 15:46:47,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:47,329 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-02-23 15:46:47,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-02-23 15:46:47,329 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:47,329 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:47,359 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-02-23 15:46:47,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:47,539 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:47,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:47,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1131578614, now seen corresponding path program 4 times [2022-02-23 15:46:47,540 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:47,540 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183797235] [2022-02-23 15:46:47,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:47,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:47,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:47,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:47,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:47,586 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:47,586 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:47,586 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183797235] [2022-02-23 15:46:47,586 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183797235] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 15:46:47,586 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020588636] [2022-02-23 15:46:47,586 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-02-23 15:46:47,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:47,587 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 15:46:47,588 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-23 15:46:47,588 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-02-23 15:46:47,625 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-02-23 15:46:47,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 15:46:47,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 34 conjunts are in the unsatisfiable core [2022-02-23 15:46:47,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 15:46:47,641 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-02-23 15:46:47,726 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-02-23 15:46:47,842 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-02-23 15:46:47,842 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-02-23 15:46:47,870 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-02-23 15:46:47,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 15:46:47,971 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-02-23 15:46:47,971 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-02-23 15:46:47,982 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-02-23 15:46:47,982 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-02-23 15:46:47,987 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-02-23 15:46:48,066 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-02-23 15:46:48,067 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020588636] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 15:46:48,067 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 15:46:48,067 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 12] total 26 [2022-02-23 15:46:48,067 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471715622] [2022-02-23 15:46:48,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 15:46:48,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-23 15:46:48,067 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:48,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-23 15:46:48,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2022-02-23 15:46:48,068 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:49,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:49,724 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2022-02-23 15:46:49,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-02-23 15:46:49,724 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-02-23 15:46:49,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:49,725 INFO L225 Difference]: With dead ends: 114 [2022-02-23 15:46:49,725 INFO L226 Difference]: Without dead ends: 111 [2022-02-23 15:46:49,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1387 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=935, Invalid=4615, Unknown=0, NotChecked=0, Total=5550 [2022-02-23 15:46:49,728 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 116 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 941 mSolverCounterSat, 258 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 258 IncrementalHoareTripleChecker+Valid, 941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:49,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 89 Invalid, 1199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [258 Valid, 941 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-23 15:46:49,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-02-23 15:46:49,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 71. [2022-02-23 15:46:49,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 62 states have internal predecessors, (69), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-23 15:46:49,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2022-02-23 15:46:49,735 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 27 [2022-02-23 15:46:49,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:49,735 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2022-02-23 15:46:49,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:49,735 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2022-02-23 15:46:49,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-02-23 15:46:49,736 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:49,736 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:49,760 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-02-23 15:46:49,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:49,957 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:49,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:49,958 INFO L85 PathProgramCache]: Analyzing trace with hash -468461934, now seen corresponding path program 1 times [2022-02-23 15:46:49,958 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:49,958 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044295006] [2022-02-23 15:46:49,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:49,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:49,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:50,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:50,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:50,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-23 15:46:50,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:50,015 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-02-23 15:46:50,015 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:50,015 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044295006] [2022-02-23 15:46:50,016 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044295006] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 15:46:50,016 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277666106] [2022-02-23 15:46:50,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:50,016 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:50,016 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 15:46:50,017 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-23 15:46:50,019 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-02-23 15:46:50,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:50,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 6 conjunts are in the unsatisfiable core [2022-02-23 15:46:50,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 15:46:50,116 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-02-23 15:46:50,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 15:46:50,160 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-02-23 15:46:50,160 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277666106] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 15:46:50,160 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 15:46:50,160 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 12 [2022-02-23 15:46:50,160 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837186252] [2022-02-23 15:46:50,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 15:46:50,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-02-23 15:46:50,161 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:50,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-02-23 15:46:50,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-02-23 15:46:50,162 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-02-23 15:46:50,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:50,306 INFO L93 Difference]: Finished difference Result 100 states and 116 transitions. [2022-02-23 15:46:50,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-02-23 15:46:50,306 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2022-02-23 15:46:50,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:50,308 INFO L225 Difference]: With dead ends: 100 [2022-02-23 15:46:50,308 INFO L226 Difference]: Without dead ends: 75 [2022-02-23 15:46:50,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2022-02-23 15:46:50,308 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 45 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:50,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 42 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-23 15:46:50,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-02-23 15:46:50,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 67. [2022-02-23 15:46:50,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 58 states have internal predecessors, (63), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-23 15:46:50,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2022-02-23 15:46:50,323 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 29 [2022-02-23 15:46:50,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:50,323 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2022-02-23 15:46:50,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-02-23 15:46:50,323 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2022-02-23 15:46:50,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-02-23 15:46:50,324 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:50,324 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:50,345 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-02-23 15:46:50,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:50,544 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:50,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:50,544 INFO L85 PathProgramCache]: Analyzing trace with hash -812414670, now seen corresponding path program 5 times [2022-02-23 15:46:50,544 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:50,544 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680319751] [2022-02-23 15:46:50,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:50,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:50,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:50,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-23 15:46:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-23 15:46:50,597 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:50,597 INFO L144 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-02-23 15:46:50,597 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680319751] [2022-02-23 15:46:50,597 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680319751] provided 0 perfect and 1 imperfect interpolant sequences [2022-02-23 15:46:50,598 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62238653] [2022-02-23 15:46:50,598 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-02-23 15:46:50,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:50,598 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-23 15:46:50,599 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-02-23 15:46:50,613 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-02-23 15:46:50,659 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-02-23 15:46:50,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-02-23 15:46:50,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2022-02-23 15:46:50,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-02-23 15:46:50,737 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:50,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-02-23 15:46:50,782 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-23 15:46:50,783 INFO L165 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62238653] provided 0 perfect and 2 imperfect interpolant sequences [2022-02-23 15:46:50,783 INFO L191 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-02-23 15:46:50,783 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 10 [2022-02-23 15:46:50,783 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582574482] [2022-02-23 15:46:50,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-02-23 15:46:50,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-02-23 15:46:50,783 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-02-23 15:46:50,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-02-23 15:46:50,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2022-02-23 15:46:50,784 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:50,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-23 15:46:50,942 INFO L93 Difference]: Finished difference Result 106 states and 120 transitions. [2022-02-23 15:46:50,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-02-23 15:46:50,942 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-02-23 15:46:50,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-23 15:46:50,943 INFO L225 Difference]: With dead ends: 106 [2022-02-23 15:46:50,943 INFO L226 Difference]: Without dead ends: 106 [2022-02-23 15:46:50,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=146, Invalid=274, Unknown=0, NotChecked=0, Total=420 [2022-02-23 15:46:50,944 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 78 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-23 15:46:50,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 32 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-23 15:46:50,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-02-23 15:46:50,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 75. [2022-02-23 15:46:50,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 66 states have internal predecessors, (70), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-23 15:46:50,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 82 transitions. [2022-02-23 15:46:50,948 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 82 transitions. Word has length 31 [2022-02-23 15:46:50,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-23 15:46:50,948 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 82 transitions. [2022-02-23 15:46:50,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-23 15:46:50,949 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 82 transitions. [2022-02-23 15:46:50,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-02-23 15:46:50,949 INFO L506 BasicCegarLoop]: Found error trace [2022-02-23 15:46:50,949 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-23 15:46:50,984 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-02-23 15:46:51,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-02-23 15:46:51,185 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-23 15:46:51,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-23 15:46:51,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1779570578, now seen corresponding path program 2 times [2022-02-23 15:46:51,185 INFO L126 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-02-23 15:46:51,185 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625411789] [2022-02-23 15:46:51,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-23 15:46:51,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-23 15:46:51,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-02-23 15:46:51,202 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-02-23 15:46:51,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-02-23 15:46:51,226 INFO L138 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-02-23 15:46:51,227 INFO L628 BasicCegarLoop]: Counterexample is feasible [2022-02-23 15:46:51,227 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-02-23 15:46:51,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-02-23 15:46:51,230 INFO L732 BasicCegarLoop]: Path program histogram: [5, 2, 1, 1, 1] [2022-02-23 15:46:51,232 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-02-23 15:46:51,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 03:46:51 BasicIcfg [2022-02-23 15:46:51,249 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-02-23 15:46:51,250 INFO L158 Benchmark]: Toolchain (without parser) took 10445.50ms. Allocated memory was 200.3MB in the beginning and 324.0MB in the end (delta: 123.7MB). Free memory was 149.8MB in the beginning and 266.9MB in the end (delta: -117.0MB). Peak memory consumption was 7.7MB. Max. memory is 8.0GB. [2022-02-23 15:46:51,250 INFO L158 Benchmark]: CDTParser took 0.09ms. Allocated memory is still 200.3MB. Free memory was 166.2MB in the beginning and 166.0MB in the end (delta: 143.4kB). There was no memory consumed. Max. memory is 8.0GB. [2022-02-23 15:46:51,250 INFO L158 Benchmark]: CACSL2BoogieTranslator took 169.46ms. Allocated memory is still 200.3MB. Free memory was 149.7MB in the beginning and 176.0MB in the end (delta: -26.3MB). Peak memory consumption was 12.2MB. Max. memory is 8.0GB. [2022-02-23 15:46:51,250 INFO L158 Benchmark]: Boogie Preprocessor took 20.45ms. Allocated memory is still 200.3MB. Free memory was 176.0MB in the beginning and 174.5MB in the end (delta: 1.5MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-02-23 15:46:51,250 INFO L158 Benchmark]: RCFGBuilder took 202.75ms. Allocated memory is still 200.3MB. Free memory was 174.5MB in the beginning and 163.9MB in the end (delta: 10.7MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2022-02-23 15:46:51,251 INFO L158 Benchmark]: IcfgTransformer took 20.89ms. Allocated memory is still 200.3MB. Free memory was 163.9MB in the beginning and 162.4MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-02-23 15:46:51,251 INFO L158 Benchmark]: TraceAbstraction took 10025.42ms. Allocated memory was 200.3MB in the beginning and 324.0MB in the end (delta: 123.7MB). Free memory was 161.9MB in the beginning and 266.9MB in the end (delta: -104.9MB). Peak memory consumption was 18.6MB. Max. memory is 8.0GB. [2022-02-23 15:46:51,252 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09ms. Allocated memory is still 200.3MB. Free memory was 166.2MB in the beginning and 166.0MB in the end (delta: 143.4kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 169.46ms. Allocated memory is still 200.3MB. Free memory was 149.7MB in the beginning and 176.0MB in the end (delta: -26.3MB). Peak memory consumption was 12.2MB. Max. memory is 8.0GB. * Boogie Preprocessor took 20.45ms. Allocated memory is still 200.3MB. Free memory was 176.0MB in the beginning and 174.5MB in the end (delta: 1.5MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 202.75ms. Allocated memory is still 200.3MB. Free memory was 174.5MB in the beginning and 163.9MB in the end (delta: 10.7MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * IcfgTransformer took 20.89ms. Allocated memory is still 200.3MB. Free memory was 163.9MB in the beginning and 162.4MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * TraceAbstraction took 10025.42ms. Allocated memory was 200.3MB in the beginning and 324.0MB in the end (delta: 123.7MB). Free memory was 161.9MB in the beginning and 266.9MB in the end (delta: -104.9MB). Peak memory consumption was 18.6MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={5:0}, str2={4:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L34] j = MAX-1 [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L35] COND TRUE i