/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-a10ec3b [2022-01-09 22:20:19,379 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-09 22:20:19,381 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-09 22:20:19,441 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-01-09 22:20:19,442 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-01-09 22:20:19,443 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-01-09 22:20:19,444 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-01-09 22:20:19,446 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-01-09 22:20:19,448 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-01-09 22:20:19,452 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-01-09 22:20:19,452 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-01-09 22:20:19,454 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-01-09 22:20:19,454 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-09 22:20:19,456 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-09 22:20:19,457 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-09 22:20:19,460 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-09 22:20:19,460 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-09 22:20:19,461 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-09 22:20:19,463 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-09 22:20:19,468 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-09 22:20:19,469 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-09 22:20:19,470 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-09 22:20:19,471 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-09 22:20:19,472 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-09 22:20:19,477 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-01-09 22:20:19,485 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-09 22:20:19,486 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-09 22:20:19,486 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-09 22:20:19,487 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_Default.epf [2022-01-09 22:20:19,504 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-09 22:20:19,504 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-09 22:20:19,504 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-01-09 22:20:19,505 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-01-09 22:20:19,505 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-01-09 22:20:19,505 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-01-09 22:20:19,506 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-01-09 22:20:19,506 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-01-09 22:20:19,506 INFO L138 SettingsManager]: * Use SBE=true [2022-01-09 22:20:19,506 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-09 22:20:19,507 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-09 22:20:19,507 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-09 22:20:19,507 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-09 22:20:19,507 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-09 22:20:19,507 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-09 22:20:19,508 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-01-09 22:20:19,508 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-09 22:20:19,508 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-09 22:20:19,508 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-09 22:20:19,508 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-09 22:20:19,508 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-09 22:20:19,508 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-09 22:20:19,508 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-09 22:20:19,509 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-09 22:20:19,708 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-09 22:20:19,722 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-09 22:20:19,724 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-09 22:20:19,725 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-09 22:20:19,725 INFO L275 PluginConnector]: CDTParser initialized [2022-01-09 22:20:19,726 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2022-01-09 22:20:19,784 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3148f3cb/42a39dfc98c041eea1c6c76b2382d711/FLAG85ca7fb08 [2022-01-09 22:20:20,114 INFO L306 CDTParser]: Found 1 translation units. [2022-01-09 22:20:20,114 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2022-01-09 22:20:20,119 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3148f3cb/42a39dfc98c041eea1c6c76b2382d711/FLAG85ca7fb08 [2022-01-09 22:20:20,516 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3148f3cb/42a39dfc98c041eea1c6c76b2382d711 [2022-01-09 22:20:20,519 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-09 22:20:20,521 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-01-09 22:20:20,524 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-09 22:20:20,524 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-09 22:20:20,527 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-09 22:20:20,527 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,528 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a3487c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20, skipping insertion in model container [2022-01-09 22:20:20,528 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,534 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-09 22:20:20,545 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-09 22:20:20,677 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/string-2.i[896,909] [2022-01-09 22:20:20,701 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-09 22:20:20,709 INFO L203 MainTranslator]: Completed pre-run [2022-01-09 22:20:20,717 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/string-2.i[896,909] [2022-01-09 22:20:20,725 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-09 22:20:20,735 INFO L208 MainTranslator]: Completed translation [2022-01-09 22:20:20,735 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20 WrapperNode [2022-01-09 22:20:20,736 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-09 22:20:20,736 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-01-09 22:20:20,737 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-01-09 22:20:20,737 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-01-09 22:20:20,742 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,749 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,768 INFO L137 Inliner]: procedures = 17, calls = 27, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 126 [2022-01-09 22:20:20,768 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-01-09 22:20:20,768 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-09 22:20:20,769 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-09 22:20:20,769 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-09 22:20:20,775 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,775 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,777 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,777 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,783 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,787 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,788 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,795 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-09 22:20:20,796 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-09 22:20:20,796 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-09 22:20:20,796 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-09 22:20:20,798 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (1/1) ... [2022-01-09 22:20:20,804 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-09 22:20:20,813 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-09 22:20:20,828 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) [2022-01-09 22:20:20,852 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 [2022-01-09 22:20:20,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-09 22:20:20,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-09 22:20:20,872 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-01-09 22:20:20,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-09 22:20:20,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-09 22:20:20,872 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-09 22:20:20,872 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-09 22:20:20,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-09 22:20:20,932 INFO L234 CfgBuilder]: Building ICFG [2022-01-09 22:20:20,934 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-09 22:20:21,054 INFO L275 CfgBuilder]: Performing block encoding [2022-01-09 22:20:21,059 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-09 22:20:21,059 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2022-01-09 22:20:21,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.01 10:20:21 BoogieIcfgContainer [2022-01-09 22:20:21,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-09 22:20:21,062 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-09 22:20:21,062 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-09 22:20:21,065 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-09 22:20:21,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.01 10:20:20" (1/3) ... [2022-01-09 22:20:21,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@618b6c6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.01 10:20:21, skipping insertion in model container [2022-01-09 22:20:21,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.01 10:20:20" (2/3) ... [2022-01-09 22:20:21,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@618b6c6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.01 10:20:21, skipping insertion in model container [2022-01-09 22:20:21,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.01 10:20:21" (3/3) ... [2022-01-09 22:20:21,071 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2022-01-09 22:20:21,075 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-01-09 22:20:21,076 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-09 22:20:21,132 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-09 22:20:21,151 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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 [2022-01-09 22:20:21,151 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-09 22:20:21,176 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:21,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-01-09 22:20:21,179 INFO L506 BasicCegarLoop]: Found error trace [2022-01-09 22:20:21,180 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-09 22:20:21,180 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-09 22:20:21,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-09 22:20:21,184 INFO L85 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2022-01-09 22:20:21,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-09 22:20:21,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826218222] [2022-01-09 22:20:21,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-09 22:20:21,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-09 22:20:21,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-09 22:20:21,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-09 22:20:21,308 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-09 22:20:21,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826218222] [2022-01-09 22:20:21,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826218222] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-09 22:20:21,309 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-09 22:20:21,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-09 22:20:21,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575951080] [2022-01-09 22:20:21,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-09 22:20:21,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-09 22:20:21,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-09 22:20:21,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-09 22:20:21,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-09 22:20:21,341 INFO L87 Difference]: Start difference. First operand has 26 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:21,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-09 22:20:21,380 INFO L93 Difference]: Finished difference Result 62 states and 95 transitions. [2022-01-09 22:20:21,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-09 22:20:21,382 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-01-09 22:20:21,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-09 22:20:21,389 INFO L225 Difference]: With dead ends: 62 [2022-01-09 22:20:21,389 INFO L226 Difference]: Without dead ends: 32 [2022-01-09 22:20:21,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-09 22:20:21,395 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-09 22:20:21,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 49 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-09 22:20:21,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-01-09 22:20:21,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-01-09 22:20:21,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:21,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2022-01-09 22:20:21,421 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2022-01-09 22:20:21,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-09 22:20:21,422 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2022-01-09 22:20:21,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:21,422 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2022-01-09 22:20:21,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-01-09 22:20:21,423 INFO L506 BasicCegarLoop]: Found error trace [2022-01-09 22:20:21,423 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, 1] [2022-01-09 22:20:21,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-09 22:20:21,424 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-09 22:20:21,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-09 22:20:21,425 INFO L85 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2022-01-09 22:20:21,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-09 22:20:21,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287675825] [2022-01-09 22:20:21,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-09 22:20:21,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-09 22:20:21,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-09 22:20:21,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-09 22:20:21,472 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-09 22:20:21,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287675825] [2022-01-09 22:20:21,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287675825] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-09 22:20:21,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401698324] [2022-01-09 22:20:21,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-09 22:20:21,473 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-09 22:20:21,473 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-09 22:20:21,475 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) [2022-01-09 22:20:21,479 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-01-09 22:20:21,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-09 22:20:21,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2022-01-09 22:20:21,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-09 22:20:21,611 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-09 22:20:21,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-09 22:20:21,692 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-09 22:20:21,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401698324] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-09 22:20:21,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-09 22:20:21,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-01-09 22:20:21,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663438487] [2022-01-09 22:20:21,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-09 22:20:21,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-01-09 22:20:21,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-09 22:20:21,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-01-09 22:20:21,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2022-01-09 22:20:21,696 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:21,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-09 22:20:21,785 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2022-01-09 22:20:21,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-09 22:20:21,786 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-01-09 22:20:21,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-09 22:20:21,788 INFO L225 Difference]: With dead ends: 79 [2022-01-09 22:20:21,788 INFO L226 Difference]: Without dead ends: 60 [2022-01-09 22:20:21,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2022-01-09 22:20:21,791 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 40 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-09 22:20:21,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 59 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-09 22:20:21,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-01-09 22:20:21,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 36. [2022-01-09 22:20:21,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:21,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2022-01-09 22:20:21,809 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 22 [2022-01-09 22:20:21,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-09 22:20:21,812 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2022-01-09 22:20:21,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:21,815 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2022-01-09 22:20:21,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-09 22:20:21,816 INFO L506 BasicCegarLoop]: Found error trace [2022-01-09 22:20:21,816 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-09 22:20:21,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-01-09 22:20:22,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-09 22:20:22,035 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-09 22:20:22,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-09 22:20:22,036 INFO L85 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 2 times [2022-01-09 22:20:22,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-09 22:20:22,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271206055] [2022-01-09 22:20:22,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-09 22:20:22,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-09 22:20:22,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-09 22:20:22,171 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-09 22:20:22,172 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-09 22:20:22,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271206055] [2022-01-09 22:20:22,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271206055] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-09 22:20:22,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295948741] [2022-01-09 22:20:22,175 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-09 22:20:22,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-09 22:20:22,175 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-09 22:20:22,178 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) [2022-01-09 22:20:22,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-01-09 22:20:22,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-09 22:20:22,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-09 22:20:22,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 6 conjunts are in the unsatisfiable core [2022-01-09 22:20:22,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-09 22:20:22,359 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-09 22:20:22,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-09 22:20:22,443 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-09 22:20:22,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295948741] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-09 22:20:22,444 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-09 22:20:22,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 8 [2022-01-09 22:20:22,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983949660] [2022-01-09 22:20:22,444 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-09 22:20:22,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-09 22:20:22,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-09 22:20:22,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-09 22:20:22,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2022-01-09 22:20:22,446 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:22,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-09 22:20:22,517 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2022-01-09 22:20:22,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-09 22:20:22,518 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-01-09 22:20:22,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-09 22:20:22,519 INFO L225 Difference]: With dead ends: 95 [2022-01-09 22:20:22,519 INFO L226 Difference]: Without dead ends: 70 [2022-01-09 22:20:22,520 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2022-01-09 22:20:22,520 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 71 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-09 22:20:22,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 59 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-09 22:20:22,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-01-09 22:20:22,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2022-01-09 22:20:22,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1538461538461537) internal successors, (45), 39 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:22,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2022-01-09 22:20:22,526 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2022-01-09 22:20:22,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-09 22:20:22,526 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2022-01-09 22:20:22,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-09 22:20:22,526 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2022-01-09 22:20:22,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-01-09 22:20:22,527 INFO L506 BasicCegarLoop]: Found error trace [2022-01-09 22:20:22,527 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-09 22:20:22,550 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-01-09 22:20:22,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-01-09 22:20:22,743 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-09 22:20:22,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-09 22:20:22,744 INFO L85 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 3 times [2022-01-09 22:20:22,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-09 22:20:22,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751292057] [2022-01-09 22:20:22,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-09 22:20:22,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-09 22:20:22,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-01-09 22:20:22,794 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-01-09 22:20:22,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-01-09 22:20:22,871 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-01-09 22:20:22,871 INFO L628 BasicCegarLoop]: Counterexample is feasible [2022-01-09 22:20:22,873 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-01-09 22:20:22,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-09 22:20:22,878 INFO L732 BasicCegarLoop]: Path program histogram: [3, 1] [2022-01-09 22:20:22,880 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2022-01-09 22:20:22,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.01 10:20:22 BoogieIcfgContainer [2022-01-09 22:20:22,928 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-01-09 22:20:22,932 INFO L158 Benchmark]: Toolchain (without parser) took 2407.07ms. Allocated memory was 177.2MB in the beginning and 240.1MB in the end (delta: 62.9MB). Free memory was 119.6MB in the beginning and 113.8MB in the end (delta: 5.8MB). Peak memory consumption was 68.2MB. Max. memory is 8.0GB. [2022-01-09 22:20:22,932 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 177.2MB. Free memory is still 136.0MB. There was no memory consumed. Max. memory is 8.0GB. [2022-01-09 22:20:22,933 INFO L158 Benchmark]: CACSL2BoogieTranslator took 211.51ms. Allocated memory was 177.2MB in the beginning and 240.1MB in the end (delta: 62.9MB). Free memory was 119.3MB in the beginning and 211.8MB in the end (delta: -92.5MB). Peak memory consumption was 9.9MB. Max. memory is 8.0GB. [2022-01-09 22:20:22,933 INFO L158 Benchmark]: Boogie Procedure Inliner took 31.54ms. Allocated memory is still 240.1MB. Free memory was 211.8MB in the beginning and 209.7MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-01-09 22:20:22,933 INFO L158 Benchmark]: Boogie Preprocessor took 26.61ms. Allocated memory is still 240.1MB. Free memory was 209.7MB in the beginning and 208.2MB in the end (delta: 1.6MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-01-09 22:20:22,935 INFO L158 Benchmark]: RCFGBuilder took 265.17ms. Allocated memory is still 240.1MB. Free memory was 208.2MB in the beginning and 196.1MB in the end (delta: 12.1MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. [2022-01-09 22:20:22,935 INFO L158 Benchmark]: TraceAbstraction took 1865.89ms. Allocated memory is still 240.1MB. Free memory was 195.6MB in the beginning and 113.8MB in the end (delta: 81.8MB). Peak memory consumption was 81.8MB. Max. memory is 8.0GB. [2022-01-09 22:20:22,937 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 177.2MB. Free memory is still 136.0MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 211.51ms. Allocated memory was 177.2MB in the beginning and 240.1MB in the end (delta: 62.9MB). Free memory was 119.3MB in the beginning and 211.8MB in the end (delta: -92.5MB). Peak memory consumption was 9.9MB. Max. memory is 8.0GB. * Boogie Procedure Inliner took 31.54ms. Allocated memory is still 240.1MB. Free memory was 211.8MB in the beginning and 209.7MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * Boogie Preprocessor took 26.61ms. Allocated memory is still 240.1MB. Free memory was 209.7MB in the beginning and 208.2MB in the end (delta: 1.6MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 265.17ms. Allocated memory is still 240.1MB. Free memory was 208.2MB in the beginning and 196.1MB in the end (delta: 12.1MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. * TraceAbstraction took 1865.89ms. Allocated memory is still 240.1MB. Free memory was 195.6MB in the beginning and 113.8MB in the end (delta: 81.8MB). Peak memory consumption was 81.8MB. 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 - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={7:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=1, string_A={6:0}, string_B={7:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=2, string_A={6:0}, string_B={7:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=3, string_A={6:0}, string_B={7:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=4, string_A={6:0}, string_B={7:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L35] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L37] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={6:0}, string_A[5 -1]=0, string_B={7:0}] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={7:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=1, string_A={6:0}, string_B={7:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=2, string_A={6:0}, string_B={7:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=3, string_A={6:0}, string_B={7:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=4, string_A={6:0}, string_B={7:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L39] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L41] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={6:0}, string_B={7:0}, string_B[5 -1]=0] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_B={7:0}] [L44] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_A[nc_A]=0, string_B={7:0}] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={7:0}] [L48] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={7:0}, string_B[nc_B]=0] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={6:0}, string_B={7:0}] [L55] COND FALSE !((inc_B-1)<