/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-19 22:01:51,153 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 22:01:51,155 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 22:01:51,193 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 22:01:51,241 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-03-19 22:01:51,266 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 22:01:51,266 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 22:01:51,267 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-19 22:01:51,267 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-19 22:01:51,268 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-19 22:01:51,268 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-19 22:01:51,269 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-19 22:01:51,269 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-19 22:01:51,269 INFO L138 SettingsManager]: * Use SBE=true [2022-03-19 22:01:51,270 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 22:01:51,270 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-19 22:01:51,271 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 22:01:51,271 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 22:01:51,271 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 22:01:51,271 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 22:01:51,271 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 22:01:51,271 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 22:01:51,271 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 22:01:51,271 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 22:01:51,271 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-19 22:01:51,272 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-19 22:01:51,272 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-19 22:01:51,272 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-19 22:01:51,272 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-19 22:01:51,272 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-19 22:01:51,272 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 22:01:51,272 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 22:01:51,485 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 22:01:51,509 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 22:01:51,511 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 22:01:51,511 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 22:01:51,512 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 22:01:51,513 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2022-03-19 22:01:51,568 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e54c076d2/28a1d3c8da26462aa56b351ae5224da6/FLAG88eb41329 [2022-03-19 22:01:51,932 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 22:01:51,933 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2022-03-19 22:01:51,939 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e54c076d2/28a1d3c8da26462aa56b351ae5224da6/FLAG88eb41329 [2022-03-19 22:01:51,948 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e54c076d2/28a1d3c8da26462aa56b351ae5224da6 [2022-03-19 22:01:51,950 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 22:01:51,951 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 22:01:51,952 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 22:01:51,952 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 22:01:51,955 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 22:01:51,955 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 10:01:51" (1/1) ... [2022-03-19 22:01:51,956 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40fdb5fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:51, skipping insertion in model container [2022-03-19 22:01:51,956 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 10:01:51" (1/1) ... [2022-03-19 22:01:51,973 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 22:01:51,986 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 22:01:52,149 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] [2022-03-19 22:01:52,164 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 22:01:52,172 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 22:01:52,189 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] [2022-03-19 22:01:52,213 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 22:01:52,221 INFO L208 MainTranslator]: Completed translation [2022-03-19 22:01:52,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52 WrapperNode [2022-03-19 22:01:52,222 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 22:01:52,223 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 22:01:52,223 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 22:01:52,223 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 22:01:52,235 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,235 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,247 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,247 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,265 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,268 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,269 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,271 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 22:01:52,271 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 22:01:52,271 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 22:01:52,272 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 22:01:52,274 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (1/1) ... [2022-03-19 22:01:52,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 22:01:52,287 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 22:01:52,297 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-19 22:01:52,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-19 22:01:52,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 22:01:52,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 22:01:52,371 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 22:01:52,372 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-19 22:01:52,372 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 22:01:52,372 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 22:01:52,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 22:01:52,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 22:01:52,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 22:01:52,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 22:01:52,443 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 22:01:52,444 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 22:01:52,653 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 22:01:52,659 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 22:01:52,659 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2022-03-19 22:01:52,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 10:01:52 BoogieIcfgContainer [2022-03-19 22:01:52,661 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 22:01:52,663 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 22:01:52,663 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 22:01:52,665 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 22:01:52,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 10:01:51" (1/3) ... [2022-03-19 22:01:52,666 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@176be374 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 10:01:52, skipping insertion in model container [2022-03-19 22:01:52,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 10:01:52" (2/3) ... [2022-03-19 22:01:52,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@176be374 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 10:01:52, skipping insertion in model container [2022-03-19 22:01:52,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 10:01:52" (3/3) ... [2022-03-19 22:01:52,668 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2022-03-19 22:01:52,672 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-19 22:01:52,672 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 22:01:52,714 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 22:01:52,721 INFO L340 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 [2022-03-19 22:01:52,721 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 22:01:52,745 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 22:01:52,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 22:01:52,749 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 22:01:52,749 INFO L499 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] [2022-03-19 22:01:52,750 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 22:01:52,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 22:01:52,754 INFO L85 PathProgramCache]: Analyzing trace with hash 739829093, now seen corresponding path program 1 times [2022-03-19 22:01:52,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 22:01:52,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814779253] [2022-03-19 22:01:52,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 22:01:52,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 22:01:52,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 22:01:52,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 22:01:52,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 22:01:52,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 22:01:52,903 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 22:01:52,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814779253] [2022-03-19 22:01:52,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814779253] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 22:01:52,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 22:01:52,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 22:01:52,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840693849] [2022-03-19 22:01:52,906 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 22:01:52,922 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 22:01:52,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 22:01:52,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 22:01:52,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 22:01:52,960 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 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 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 22:01:53,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 22:01:53,079 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2022-03-19 22:01:53,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 22:01:53,081 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 22 [2022-03-19 22:01:53,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 22:01:53,086 INFO L225 Difference]: With dead ends: 73 [2022-03-19 22:01:53,086 INFO L226 Difference]: Without dead ends: 36 [2022-03-19 22:01:53,088 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 22:01:53,091 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 47 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 22:01:53,092 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 45 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 22:01:53,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-19 22:01:53,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2022-03-19 22:01:53,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 22:01:53,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2022-03-19 22:01:53,120 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2022-03-19 22:01:53,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 22:01:53,120 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2022-03-19 22:01:53,120 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 22:01:53,120 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2022-03-19 22:01:53,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 22:01:53,121 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 22:01:53,121 INFO L499 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, 1, 1, 1, 1, 1, 1] [2022-03-19 22:01:53,121 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 22:01:53,122 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 22:01:53,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 22:01:53,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1075962823, now seen corresponding path program 1 times [2022-03-19 22:01:53,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 22:01:53,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026236143] [2022-03-19 22:01:53,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 22:01:53,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 22:01:53,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 22:01:53,232 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 22:01:53,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 22:01:53,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 22:01:53,239 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 22:01:53,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026236143] [2022-03-19 22:01:53,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026236143] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 22:01:53,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973258618] [2022-03-19 22:01:53,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 22:01:53,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 22:01:53,240 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 22:01:53,254 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 22:01:53,284 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 22:01:53,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 22:01:53,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2022-03-19 22:01:53,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 22:01:53,435 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 22:01:53,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 22:01:53,515 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 22:01:53,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973258618] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 22:01:53,516 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 22:01:53,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-03-19 22:01:53,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881292128] [2022-03-19 22:01:53,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 22:01:53,521 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 22:01:53,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 22:01:53,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 22:01:53,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-03-19 22:01:53,524 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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) [2022-03-19 22:01:53,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 22:01:53,650 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2022-03-19 22:01:53,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 22:01:53,655 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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 28 [2022-03-19 22:01:53,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 22:01:53,658 INFO L225 Difference]: With dead ends: 79 [2022-03-19 22:01:53,658 INFO L226 Difference]: Without dead ends: 58 [2022-03-19 22:01:53,659 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-03-19 22:01:53,660 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 66 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 22:01:53,660 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 37 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 22:01:53,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-19 22:01:53,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2022-03-19 22:01:53,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 22:01:53,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2022-03-19 22:01:53,678 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 28 [2022-03-19 22:01:53,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 22:01:53,678 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2022-03-19 22:01:53,678 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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) [2022-03-19 22:01:53,678 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2022-03-19 22:01:53,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-19 22:01:53,679 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 22:01:53,680 INFO L499 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, 1, 1, 1, 1, 1, 1] [2022-03-19 22:01:53,701 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-19 22:01:53,899 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 22:01:53,899 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 22:01:53,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 22:01:53,900 INFO L85 PathProgramCache]: Analyzing trace with hash 173558265, now seen corresponding path program 2 times [2022-03-19 22:01:53,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 22:01:53,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502380483] [2022-03-19 22:01:53,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 22:01:53,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 22:01:53,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 22:01:54,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 22:01:54,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 22:01:54,100 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 22:01:54,101 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 22:01:54,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502380483] [2022-03-19 22:01:54,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502380483] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 22:01:54,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108409873] [2022-03-19 22:01:54,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 22:01:54,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 22:01:54,103 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 22:01:54,104 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 22:01:54,107 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 22:01:54,173 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 22:01:54,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 22:01:54,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 22:01:54,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 22:01:54,232 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 22:01:54,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 22:01:54,292 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-19 22:01:54,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108409873] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 22:01:54,293 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 22:01:54,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2022-03-19 22:01:54,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940194862] [2022-03-19 22:01:54,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-19 22:01:54,293 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 22:01:54,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 22:01:54,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 22:01:54,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-03-19 22:01:54,294 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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) [2022-03-19 22:01:54,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 22:01:54,395 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2022-03-19 22:01:54,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 22:01:54,396 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 40 [2022-03-19 22:01:54,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 22:01:54,396 INFO L225 Difference]: With dead ends: 93 [2022-03-19 22:01:54,396 INFO L226 Difference]: Without dead ends: 66 [2022-03-19 22:01:54,397 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-03-19 22:01:54,397 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 83 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 22:01:54,398 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 32 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 22:01:54,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-19 22:01:54,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2022-03-19 22:01:54,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 22:01:54,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-03-19 22:01:54,402 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2022-03-19 22:01:54,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 22:01:54,402 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-03-19 22:01:54,403 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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) [2022-03-19 22:01:54,403 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-03-19 22:01:54,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 22:01:54,403 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 22:01:54,403 INFO L499 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, 1, 1, 1, 1, 1, 1] [2022-03-19 22:01:54,422 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 22:01:54,620 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-19 22:01:54,621 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 22:01:54,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 22:01:54,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1461422279, now seen corresponding path program 3 times [2022-03-19 22:01:54,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 22:01:54,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172063549] [2022-03-19 22:01:54,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 22:01:54,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 22:01:54,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 22:01:54,679 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 22:01:54,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 22:01:54,731 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 22:01:54,732 INFO L618 BasicCegarLoop]: Counterexample is feasible [2022-03-19 22:01:54,732 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-19 22:01:54,733 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-19 22:01:54,735 INFO L719 BasicCegarLoop]: Path program histogram: [3, 1] [2022-03-19 22:01:54,737 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-19 22:01:54,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.03 10:01:54 BoogieIcfgContainer [2022-03-19 22:01:54,758 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-19 22:01:54,758 INFO L158 Benchmark]: Toolchain (without parser) took 2807.28ms. Allocated memory is still 186.6MB. Free memory was 134.5MB in the beginning and 118.0MB in the end (delta: 16.5MB). Peak memory consumption was 15.6MB. Max. memory is 8.0GB. [2022-03-19 22:01:54,758 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 186.6MB. Free memory is still 151.1MB. There was no memory consumed. Max. memory is 8.0GB. [2022-03-19 22:01:54,759 INFO L158 Benchmark]: CACSL2BoogieTranslator took 270.06ms. Allocated memory is still 186.6MB. Free memory was 134.4MB in the beginning and 161.5MB in the end (delta: -27.2MB). Peak memory consumption was 7.2MB. Max. memory is 8.0GB. [2022-03-19 22:01:54,759 INFO L158 Benchmark]: Boogie Preprocessor took 48.27ms. Allocated memory is still 186.6MB. Free memory was 161.5MB in the beginning and 159.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-19 22:01:54,759 INFO L158 Benchmark]: RCFGBuilder took 389.83ms. Allocated memory is still 186.6MB. Free memory was 159.6MB in the beginning and 147.3MB in the end (delta: 12.3MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. [2022-03-19 22:01:54,759 INFO L158 Benchmark]: TraceAbstraction took 2094.98ms. Allocated memory is still 186.6MB. Free memory was 147.0MB in the beginning and 118.0MB in the end (delta: 29.0MB). Peak memory consumption was 28.6MB. Max. memory is 8.0GB. [2022-03-19 22:01:54,760 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 186.6MB. Free memory is still 151.1MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 270.06ms. Allocated memory is still 186.6MB. Free memory was 134.4MB in the beginning and 161.5MB in the end (delta: -27.2MB). Peak memory consumption was 7.2MB. Max. memory is 8.0GB. * Boogie Preprocessor took 48.27ms. Allocated memory is still 186.6MB. Free memory was 161.5MB in the beginning and 159.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 389.83ms. Allocated memory is still 186.6MB. Free memory was 159.6MB in the beginning and 147.3MB in the end (delta: 12.3MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. * TraceAbstraction took 2094.98ms. Allocated memory is still 186.6MB. Free memory was 147.0MB in the beginning and 118.0MB in the end (delta: 29.0MB). Peak memory consumption was 28.6MB. 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 - 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)<